QUESTION BANK
L SOLID STATE
Case based question
By X- Ray studies, the packing of atoms in a crystal if gold is found to be in layers such that starting from any layer, every fourth layer is found yo be exactly identical. The density of gold is found to be 19.4g/ cm3 and its atomic mass is 197amu.
The coordination no. of gold atom in the crystal is
4 (b) 6 ( c) 8 ( d) 12
2. The fraction occupied by hold atoms in the crystal is
0.52 (b) 0.68 © 0.74 (d)1.0
3. The length of the edge of the unit cell will be
407pm ( b)189pm ( c)814pm ( d)204pm
4.Assuming gold atom yo be spherical its radius will be
( a) 203.5pm ( b)143.9pm © 176.2pm
(d) 287.8pm
MCQ
5.The fraction of the total volume occupied by the atoms present in a simple cube is
(a) π4
(b) π6
(c) π3√2
(d) π4√2
6.Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order
(a) 287 pm
(b) 574 pm
(c) 124.27 pm
(d) 143.5 pm
7.element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is
(a) 10.37 g cm-3
(b) 5.19 g cm-3
(c) 7.29 g cm-3
(d) 2.14 g cm-3
8.Which of the following crystals does not exhibit Frenkel defect?
(a) AgBr
(b) AgCl
(c) KBr
(d) ZnS
9.Assertion : Diamond is a precious stone.
Reason : Carbon atoms are tetrahedrally arranged in diamond.
(a)both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If the assertion and reason both are false.
10.Assertion : Crystalline solids have short range order.
Reason : Amorphous solids have long range order.
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d)If the assertion and reason both are false.
11. Assertion : In any ionic solid (MX) with Schottky defects, the number of positive and negative ions are same.
Reason : Equal number of cation and anion vacancies are present.
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If the assertion and reason both are false.
12.Define body centered cubic cell and face centered cubic unit cell.
13.Calculate the packing efficiency of a metal crystal for a simple cubic lattice.
14.Define the term
Unit cell
Coordination no.
Frenkel defect
15.Give reason
ZnO turns yellow on heating.
Schottky defect lowers the density of related solid
Frenkel defect are found in alkali metal halides.
16.What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy l/3rd of tetrahedral voids?
17.What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 2/3rd of tetrahedral voids?
18The compound CuCl [Formula mass = 99 g mol-1] has FCC structure like ZnS. Its density is 3.4 g cm-3. What is the length of the edge of unit cell? [NA = 6.02 X 1023 mol-1]
QUESTION BANK
L- 2 SOLUTIONS
Paragraph based question
The properties of dilute or ideal solutions which depend only upon the concentration of the solute in the solution and no other characteristics are known as colligative properties. There are in all four such properties i.e.relative lowering in vapour pressure, osmotic pressure, elevation in boiling point and depression in freezing point temperature. All of them help in calculating the observed molar mass of the solute which is inversely proportional to the colligative property involved.Out of these osmotic pressure may be regarded as the best for the determination of molecular mass of the solute.
1.When liquids A and B are mixed, hydrogen bonding occurs.The solution will show
( a) positive deviation from Raoult' law
(b)negative deviation from Raoult' law
© no deviation from Raoult' s law
( d) slightly increase in volume
2.The azeotropic mixture of water and HCl boils at 108.50C when the mixture is distilled.It is possible to obtain
pur HCl
Pure water
Pure water as well as pure HCl
neither HCl nor water in their pure states
3.On freezing an aqueous solution of sugar, the solid which starts separating out is
sugar
ice
solution with the same composition
solution with the different
composition
4. The value of osmotic pressure does not depend upon
concentration of the solution
temperature of the solution
no. of the particles of the solute present
structure of the solute particles
1.Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
(a) 0.46
(b) 0.40
(c) 0.20
(d) 0.36
2.Which of the following condition is not satisfied by an ideal solution?
(a) ΔHmixing = 0
(b) ΔVmixing = 0
(c) Raoult’s Law is obeyed
(d) Formation of an azeotropic mixture
3.Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be
(a) 0.33
(b) 0.666
(c) 0.3 × 10-2
(d) 3
4.People add sodium chloride to water while boiling eggs. This is to
(a) decrease the boiling point.
(b) increase the boiling point.
(c) prevent the breaking of eggs.
(d) make eggs tasty.
Assertion reason type questions
5.Assertion-Ethyl alcohol and water form maximum boiling azeotrope.
Reason- Attractive forces in solution tend to increase.
6.Assertion-Cooking time is reduced in pressure cooker.
Reason- Boiling point of water inside the pressure cooker is lowered.
7. Assertion- Molarity of the solution changes with temperture.
Reason- Molarity is a colligative property.
8.Assertion-Isotonic solution donor show any osmosiswhen placed side by side.
Reason-Isotonic solution have same solute concentration.
9.What is the significance of Henery ' law constant KH?
10.Why is the vapour pressure of an aqueous solution of glucose lower than that of water?
11.How does sprinkling of salt help in clearing the snow covered roads in hilly areas?Explain the phenomenon involved in the process.
12.What is semipermeable membrane? Give an example of a material used for making semipermeable membrane for camembraneout reverse osmosis.
13.A solution containing 10.2g of glycerine per litre is found to be isotonic with 2% solution of glucose ( molar mass=180g/ mol).Calculatethe molar mass of glycerine.
14.At what concentration of solute P the solution will be isotonic with a 5% solution of urea? ( Molar mass of P= 342g/mol)
15.Calculate the osmotic pressure of 5% solution of cane sugar ( sucrose) at 150C.
QUESTION BANK
L-3 Electrochemistry
MCQ
1.The charge required for the reduction of 1 mol of MnO4– to MnO2 is
(a) 1 F
(b) 3 F
(c) 5 F
(d) 6 F
2.NH4NO3 is used in salt bridge because
(a) it forms a jelly like material with agar-agar.
(b) it is a weak electrolyte.
(c) it is a good conductor of electricity.
(d) the transport number of NH4+ and NO3– ions are almost equal.
3. The reaction, 3ClO– (aq) → ClO3 (aq) + 2Cl– (aq) is an example of
(a) Oxidation reaction
(b) Reduction reaction
(c) Disproportionation reaction
(d) Decomposition reaction
4.The emf of the cell:
Ni / Ni2+ (1.0 M) // Au3+ (1.0 M) / Au (E° = -0.25 V for Ni2+/Ni; E° = 1.5 V for Au3+/Au) is
(a) 1.25 V
(b) -1.25 V
(c) 1.75 V
(d) 2.0 V
Assertion reason type questions
1.Assertion- Copper sulfate can be stored in zinc vessel.
Reason- Zinc is less reactive than copper.
2.Assertion- Current stops flowing when Ecell=0
Reason- Equilibrium of the cell reaction is attained.
3. Assertion- Conductivity of all electrolyte decreases on dilution.
Reason- On dilution no.of ions per unit volume decreases.
4.Assertion- For measuring resistance of an ionic solution an AC sources used.
Reason- Concentration of an ionic solution will change if DC source is used.
Short answer type questions
1(i)Why is alternating current used for measuring resistance of an electrolytic solution?
(ii) Which reference electrode is used to measure the electrode potential of other electrodes?
2.What is salt bridge? State its functions
Numerical problems of NCERT
QUESTION BANK
L-4 CHEMICAL KINETICS
Case based question
The rate of reaction depends on the concentration of the reacting species.e.reactants in rate equation or rate law.
Consider the gaseous reaction
aA+bB=Product
The rate law is
r=k[A]x[ B]y
Here x+y is the order of reaction. If either of A or B is taken in excess, then order with respect to that reactant will be taken as zero.
1.A= product.If concentration of A increases four times then its rate increases two times .The order w.r.t.A will be
2
1
½
can't be predicted
2. In the reaction A+B=product, if the concentration of B is kept fixed and concentration of A is increased 3 times, the rate of reaction increases 27 times.If the concentration of both A and B is doubled, the rate increase 8 times.The order w.r.t.A is
3
2
1
Zero
3. In the above question order w.r.t B is
3
2
1
zero
MCQ
1.Which among the following is a false statement?
(a) Rate of zero order reaction is independent of initial concentration of reactant.
(b) Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.
(c) Molecularity of a reaction may be zero or fraction.
(d) For a first order reaction, t1/2=0.693/K
2.For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is
(a) Two
(b) One
(c) Half
(d) Zero
3.rate of a certain hypothetical reaction
A + B + C → products
is given by r = −d[A]dtK[A]1/2[B]1/3[C]1/4. The order of the reaction is
(a) 13/11
(b) 13/14
(c) 12/13
(d) 13/12
4.In the formation of S02 by contact process;
2SO2 + O2 → 2SO3, the rate of reaction was measured as −d[O2]dt = 2.5 × 10-4 mol L-1s-1.
The rate of formation of of S03 will be
(a) -5.0 × 10-4 mol L-1s-1
(b) -1.25 × 10-4 mol L-1s-1
(c) 3.75 × 10-4 mol L-1s-1
(d) 5.00 × 10-4 mol L-1s-1
5.For the reaction N2 + 3H2 → 2NH3 if Δ[NH3]Δt = 2 × 10-4 mol L-1s-1, the value of −Δ[H2]/Δt would be
(a) 1 × 10-4 mol L-1s-1
(b) 3 × 10-4 mol L-1s-1
(c) 4 × 10-4 mol L-1s-1
(d) 6 × 10-4 mol L-1s-1
Assertion reason questions
1.Assertion- Order and molecularity of a reaction are always equal.
Reason- Complex reactions take place in steps and slowest step determines the reaction order.
2.Assertion- Order of a reaction can be fractional.
Reason- Order of a reaction cannot be written from the balanced chemical equation.
3.Assertion- The molecularity of reaction N2+3H2=2NH3 is 2.
Reason- The order of reaction is 3/2.
4.Assertion-Alkaline hydrolysis of ester is known as saponification.
Reason- Alkaline hydrolysis of ester is a first order reaction.
Short answer type questions
1.Derive integrated rate equation for first order reactions.
2.State unit of rate constant for zero , first and second order reactions
3.Explain pseudo molecular first order reactions with an example.
4.After 24 hours only 0.125g out of the initial quantity of 1 g of a radioactive isotope remains behind .What is its half life period?
All numericals from NCERT
QUESTION BANK
L-5 Surface Chemistry
Case based question
There are certain substances which behave as normal strong electrolytes at low concentration but at higher concentration they behave as colloidal solutions due to formation of aggregated particles. Such colloids are called associated colloids and the aggregated particles are called Michelle.Soap and detergents are the examples of associated colloids.The formation of Michelle takes place above certain concentration called critical Michelle concentration (CMC) and a characteristic temperature.
1.Micelles are
Emulsion cum gel
Associated colloids
Adsorbed catalysts
Ideal solution
2.Which part of soap(RCOO-) dissolves grease and forms micelle?
R Part
-COO- part
Both a and b
None of the above
3. What type of molecules form Michelle?
Non polar molecules
Polar molecules
Surfactant molecules
Salt of weak acid and weak base
4. Michelle are formed only
Below the CMC and the Kraft temperature
Above the CMC and below the Kraft temperature
Above the CMC and above the Kraft temperature
Below the CMC and above the Kraft temperature.
MCQ
1.When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This pheno¬menon is known as
(a) dialysis
(b) peptization
(c) protection
(d) dissolution
2.Lyophillic colloids are stable due to
(a) charge on the particles.
(b) large size of the particles.
(c) small size of the particles.
(d) layer of dispersion of medium on the particles.
3.Cottrell precipitator is used to
(a) precipitate mud from muddy water.
(b) precipitate carbon particles from smoke.
(c) purify the ordinary drinking water.
(d) precipitate salts in qualitative analysis.
4. The potential difference between the fixed charged layer and the diffused layer having opposite charge is called
(a) Zeta potential
(b) Electrokinetic potential
(c) Both (a) and (b)
(d) Streaming potential
5.Peptization is a process of
(a) precipitation of colloidal particles.
(b) purification of colloids.
(c) dispersing precipitate into colloidal solution.
(d) movement of colloidal particles in the electric field.
Assertion reason type questions
1.Assertion- In physisorption adsorption decreases with increase in temperature.
Reason- Physisorption is of exothermic nature.
2.Assertion- Colloidal sol scatter light while true solution does not.
Reason- The particles in a colloidal slo move slowly thain a true solution.
3.Assertion-Aqueous gold colloidal sol is red in colour.
Reason- The colour arises due to scattering of light by particles of gold.
4. Assertion- AgI changes to positively charged colloidal sol in presence of excess of KI.
Reason- It is due to adsorption of I-ions on AgI.
SHORT AND LONG ANSWER TYPE QUESTIONS
What modifications can you suggest in the Hardy Schulze law?
Why is the ester hydrolysis slow in the beginning and becomes faster after some time?
How does a delta form at the meeting place of sea and river water?
Why does lather get hardened after tanning?
QUESTION BANK
L- p Block elements
Case based question
The noble gases have closed shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other inter atomic interaction. The direct reactions of xenon with fluorine leads to a series of compounds with oxidation number +2,+4 and +6.XeF4 reacts violently with water to give XeO3.The compounds of Xenon show stereochemistry and their geometry can be deduced considering the total no. of electrons in valence shell.
Argon is used in arc welding because of
ability to lower reactivity of metals
ability to lower the melting point of the solid
flammability
high calorific value
2. Structure of XeO3
Linear
Planar
Pyramidal
T-shaped
3. XeF4 and XeF6 are expected to be
Oxidizing
Reducing
Unreactive
Strongly basic
MCQ
1.H2S is more acidic than H2O because
(a) oxygen is more electronegative than sulphur.
(b) atomic number of sulphur is higher than oxygen.
(c) H — S bond dissociation energy is less as compared to H — O bond.
(d) H — O bond dissociation energy is less also compared to H — S bond.
2.The boiling points of hydrides of group 16 are in the order
(a) H2O > H2Te > H2S > H2Se
(b) H2O > H2S > H2Se > H2Te
(c) H2O > H2Te > H2Se > H2S
(d) None of these
3.Fluorine differs from rest of the halogens in some of its properties. This is due to
(a) its smaller size and high electronegativity.
(b) lack of d-orbitals.
(c) low bond dissociation energy.
(d) All of the these
4.The set with correct order of acidity is
(a) HClO < HClO2 < HClO3 < HClO4
(b) HClO4 < HClO3 < HClO2 < HClO
(c) HClO < HClO4 < HClO3 < HClO2
(d) HClO4 < HClO2 < HClO3 < HClO
5.When chlorine reacts with cold and dilute solution of sodium hydroxide, it forms
(a) Cl– and ClO–
(b) Cl– and ClO2–
(c) Cl– and ClO3–
(d) Cl– and ClO4–
Assertion reason type questions
1.Assertion- Fluorine is the strongest oxidizing agent in halogens.
Reason- It displaces other halogens from its aqueous solution.
2.Assertion- Molecular nitrogen is less reactive than molecular oxygen.
Reason- The bond length of N2 is shorter than that of oxygen.
3.Assertion-Chlorine gas bleaches the articles permanently.
Reason- Cl2 is a strong reducing agent.
4.Assertion- Noble gase have highest I.E.in their respective periods.
Reason- Noble gases have stable closed shell electronic configuration.
Short answer type questions
Explain why ozone is thermodynamically less stable than oxygen?
Out of H2O and H2S which o e has higher bond angle and why?
SF6 is known but SCl6 is not.Why?
Write chemical reactions
Copper reacts with dilute nitric acid.
Excess ammonia is treated with chlorine
Ammonia is catalytic catalytically oxidized
5.Draw the structure of three oxoacids of Chlorine.
6.Draw the structure of following oxoacids of sulphur
Sulphurous acid
Marshall's acid
Pyrosulphuric acid
Long answer type questions
1.Give the reason
a.Bi is strong oxidizing agent in pentavalent state.
b. Nitrogen show less tendency of carnation than phosphorus.
c. Ammonia is a good complexing agent.
d.16 th group is called chalcogens
e.HF is not stored in glass bottles but is kept in wax bottles.
QUESTION BANK
L- d block elements
Case based question
Transition elements show variable oxidation states.This is due to their valence electrons which are found in two different orbitals i.e.ns and ( n-1) d.Upto ( +II) oxidation state ns electrons are involved but in higher oxidation states, electrons of ( n-1) d subshells are also involved.
1.The most common oxidation state shown by 1st row of transition elements is
(+II)
(+III)
(+IV)
All of these
2. The transition metal which show the highest oxidation state is
Mn
Pt
Fe
Ni
3. The cause of variable oxidation states among transition elements is that
They all exist in more than one O.S.
They all form complex compounds
The valence electrons in them are found in two different subshell.
They all have paired subshell.
MCQs
1.Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is
(a) high heat of vaporization.
(b) high ionization energies.
(c) low heats of hydration.
(d) complex forming nature.
2.Anomalous electronic configuration in the 3d series are of
(a) Cr and Fe
(b) Cu and Zn
(c) Fe and Cu
(d) Cr and Cu
3.CuSO4. 5H2O is blue is colour because
(a) It contains water of crystallization.
(b) SO42- ions absorb red light.
(c) Cu2+ ions absorb orange red light.
(d) Cu2+ ions absorb all colours except red from the white light.
4.Transistion elements form alloys easily because they have
(a) Same atomic number
(b) Same electronic configuration
(c) Nearly same atomic size
(d) None of the above
5.Which one of the following characteristics of the transistion metals is associated with higher catalytic activity?
(a) High enthalpy of atomisation
(b) Paramagnetic behaviour
(c) Colour of hydrate ions
(d) Variable oxidation states
Assertion reason type questions
1.Assertion- The maximum O.S.of Cr is+6 in its compounds.
Reason- Cr has only 6 electrons in ne and (n-1) d orbitals.
1.Assertion- Cuprous salts are geomagnetic in nature.
Reason- Cu+ ion has filled 3d orbitals.
3.Assertion-FeSO4.7H2O always contains traces of Fe3+ions.
Reason-This is due to oxidation of Fe2+ to Fe3+.
4.Assertion- Mn shows a no. Of oxidation state.
Reason- The difference of energy between 3d and 4s subshell is large.
Short and long answer type questions
Why transition metals form complexes?
Why is platinum(IV) state more stable than nickel(II) state?
Why do the transition metals show higher enthalpy of atomisation?
Why are steel and cast iron harder than pure iron?
Why is Cu(I) colourless while Cu(II) is blue in aqueous solution?
Why do transition metals act as catalysts?
Calculate the magnetic moment of a covalent ion in aqueous solution if its atomic no.is 25.
QUESTION BANK
L-9 COORDINATION COMPOUNDS
Case based question
When a metal rod M is dipped in an aqueous colorless concentrated solution of compound N, the solution becomes light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous ammonia dissolves O and gives an intense blue solution.
1.The metal rod is
Fe
Cu
Ni
Co
2.The compound N is
AgNO3
Zn( NO3)2
Al( NO3)3
Pb( NO3)2
3. The final solution contains
[Pb( NH3)4] +2 and [CoCl4]+2
Al( NH3)4] +3 and [Cu(NH3)4]+2
Ag( NH3)2] + and [Cu(NH3)]+2
Pb( NH3)4] + and [Ni(NH3)6]+2
MCQs
Trunbull’s blue is
(a) Ferricyanide
(b) Ferrous ferricyanide
(c) Ferrous cyanide
(d) Fe3[Fe(CN)6]4
2.Primary and secondary valency of Pt in [Pt(en)2Cl2] are
(a) 4, 4
(b) 4, 6
(c) 6, 4
(d) 2, 6
3. The complex ions [Co(NH3)5(NO2)]2+ and [Co(NH3)5 (ONO)]2+ are called
(a) Ionization isomers
(b) Linkage isomers
(c) Co-ordination isomers
(d) Geometrical isomers
4. Which of the following has square planar structure?
(a) [NiCl4]2-
(b) [Ni(CO)4]
(c) [Ni(CN)4]2-
(d) None of these
5.Mohr’s salt is
(a) Fe2(SO4) 3 . (NH4)2SO4 . 6H2O
(b) FeSO4 . (NH4)2 . SO4 . 6H2O
(c) MgSO4 . 7H2O
(d) FeSO4 . 7H2O
Assertion reason type questions
1.Assertion- Toxic metal ions are removed by the chelating ligands.
Reason- Chelate complexes tend to be more stable.
2..Assertion- Ni(dmg)2is a square planar complex.
Reason- Chelation effect is present in Ni(dmg)2.
3.Assertion- The ligand N3-is names as nitrido.
Reason- It is derived from NH3.
4.Assertion- [Fe(H2O)5NO]SO4 is paramagnetic.
Reason- Fe in Fe(H2O)5NO]SO4 has three unpaired electrons.
Short and long answer type questions
Which complex is used in chemotherapy? Mention it's common and IUPAC name.State the hybridisation and draw its structure.
How does EDTA help as a cure for lead poisoning?
Is the complex [Ni(CO)4] paramagnetic in nature? Explain the reason.
Give the formulae
pentamminebromidocobaly(III) sulphate
pentamminesulphatocobalt(III) ion
hexammineiron(III)hexacyanoferrate(III)
hexammineiron (III) nitrate
potassiumhexafluorocobaltate(III)
QUESTION BANK
L-10 HALOALKANES AND HALOARENES
SN1 reaction of alkyl halides lead to
(a) Retention of configuration
(b) Racemisation
(c) Inversion of configuration
(d) None of these
2.p-djchlorobenzene has higher melting point than its o- and m- isomers because
(a) p-dichlorobenzene is more polar than o- and m- isomer.
(b) p-isomer has a symmetrical crystalline structure.
(c) boiling point of p-isomer is more than o- and m-isomer.
(d) All of these are correct reasons.
3.Fitting reaction can be used to prepare
(a) Toluene
(b) Acetophenon
(c) Diphenyl
(d) Chlorobenzene
4.Which of the following undergoes nucleophilic substitution exclusively by SN 1 mechanism?
(a) Benzyl chloride
(b) Ethyl chloride
(c) Chlorobenzene
(d) Isopropyl chloride
5.Which of the following is most reactive towards SN1 reaction?
(a) C6H5C(CH3)C6H5Br
(b) C6H5CH2Br
(c) C6H5CH(C6H5)Br
(d) C6H5CH(CH3)Br
Assertion reason type questions
1.Assertion- Alkyl iodide are more reactive than alkyl chloride.
Reason- I- is better leaving group thanCl-.
2.Assertion- The SN2 reaction of an optically active compound proceeds with complete inversion of configuration.
Reason- The SN2 reaction is bimolecular.
3.Assertion- Diastereoners have different physical properties.
Reason- They are non- superimposable mirror images.
4.Assertion- Alkyl iodide can be prepared by treating alkyl chlorides/ alkyl bromides with NaI in acetone.
Reason- NaCl and NaBr are soluble in acetone while NaI is not.
Short and long answer type questions
1.What happens when
Ethyl bromide is treated with silver cyanide.
Ethyl bromide is heated with alcoholic KOH.
2. What is Saytzev rule? Explain with example
3. From ethyl bromide how will you prepare the following
n- butane
Dimethyl ether
Ethanol
4.Define the following
Dextrorotatory
Plane polarized light
Anomers
Racemisation
Inversion
Question Bank
L-1Alcohols,phenols and ethers
MULTIPLE CHOICE QUESTIONS
1.Benzenediazonium chloride on reaction with phenol in weakly basic medium gives
(a)diphenyl ether
(b)p-hydroxyazobenzene
(c)chlorobenzene
(d)Benzene
2.When phenol is treated with excess bromine water it gives
(a)m-bromophenol
(b)o- and p-bromophenol
(c)2,4-dibromophenol
(d)2,4,6-tribromophenol
3.Dehydration of alcohol is an example of
(a)addition reaction
(b)elimination reaction
(c)substitution reaction
(d)redox reaction
4.Which of the following is formed when phenol is exposed to air?
(a)o-Benzoquinone
(b)p-Benzoquinone
(c)Phenoquinone
(d)o-and p-Benzoquinone
5.alcohol which does not react with Lucas reagent is
(a)isobutyl alcohol
(b)n-butanol
(c)tert-butyl alcohol
(d)sec-butyl alcohol
Assertion reason based questions
1.Assertion : Alcohols have higher boiling points than ethers of comparable molecular masses.
Reason : Alcohols and ethers are isomeric in nature
2.assertion- p- nitrophenol is a stronger acid than o- nitrophenol.
Reason-Intramolecular hydrogen bonding makes o- isomer weaker than p-isomer.
3.assertion-Benzenediazonium chloride on boiling with water gives phenol.
Reson- C-N bond is polar.
4.Assertion- Phenol forms 2,4,6-tribromophenol on treatment with Br2 in CS2 at 273K.
Reason-Bromine polarizes in CS2.
5.Assertion-Traces of moisture from phenol can be easily removed by distilling with Na metal.
Reason-Water is more acidic than phenol.
Short and long answer type questions
How is phenol synthesized from benzene?
Write short notes on
a.Kolbe reaction
b.Reimer-Tiemann reaction
3.Explain Williamson synthesis
4.Discuss the hydroboration oxidation reaction of alkenes
L-12 Aldehyde ,ketone and carboxylic acid
1.Assertion (A) Aldehydes and ketones, both react with Tollen's reagent to form silver mirror.
Reason (R) Both, aldehydes and ketones contain a carbonyl group.
2. Assertion: Lower aldehydes and ketones are soluble in water but the solubility decreases as the molecular masses increase.
Reason: Distinction between aldehydes and ketones can be made by Tollens’ test.
3.Assertion-Formic acid reduces Tollen's reagent.
Reason-Compounds containing CHO group reduces Tollen's reagent.
4.Assertion -The pka of acetic acid is lower than that od phenol.
Reason-Phenoxide ion is more resonance stabilized than acetate ion.
5.Assertion- 2.2-Dimethylpropanalgives Cannizaro reactio with conc. KOH.
Reason-Cannizaro is a disproportionation reaction.
Multiple choice questions
1.Which of the following reactions will give benzolphenone?
(i) Benzoyl chloride + Benzene + AlCl3
(ii) Benzoyl chloride + Phenylmagnesium bromide
(iii) Benzoyl chloride + Diphenyl cadmium
(a) (i)and(ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (i), (ii) and (iii)
2.Propanone can be prepared from ethyne by
(a) passing a mixture of ethyne and steam over a catalyst, magnesium at 420°C
(b) passing a mixture of ethyne and ethanol over a catalyst zinc chromite
(c)boiling ethyne with water in the presence of HgSO4 and H2SO4
(d) treating ethyne with iodine and NaOH
3.The oxidation of toluene to benzaldehyde by chromyl, chloride is called
(a) Etard reaction
(b) Riemer-Tiemann reaction
(c) Wurtz reaction
(d) Cannizzaro’s reaction
4.There is a large difference in the boiling points of butanal and butanal-1-oldueto
(a) intermolecular hydrogen bonding in butan-1-ol
(b) intermolecular hydrogen bonding in butanal
(c) higher molecular mass of butan-1-ol
(d) resonance shown by butanal
5.Which of the following will undergo aldol condensation?
(a) CH2 = CHCHO
(b) CH = CCHO
(c) C6H5CHO
(d) CH3CH2CHO
Short answer type questions
1.Why is benzoic acid less soluble in water than acetic acid?
2.write method of preparation of urotropine and its use.
3.pka of chloroacetic acid is lower than pka of acetic acid.Explain
4.How can you distinguish an alcohol and a carboxylic acid?
5.Why HCOOH does not give HVZ reaction but CH3COOH does?
6. Propanone is less reactive than ethanol towards nucleophilic addition reaction. Give reason.
L- Amines
Paragraph based question
All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, anilineis a weaker base than
ammonia.The basic strength of the substituted airlines, however, depends upon the nature of the substituent.Whereas electron donating groups tend to increase, electron withdrawing groups tend to decrease the basic strength.The base strengthening effect of the electron donating groups and base weakening effect of the electron withdrawing groups is however more pronounced at p- position.However,due to ortho effect, o-substituted airlines are weaker base than airlines regardless of the nature of substituent whether electron donating or electron withdrawing .
1.Arrange the following amines in decreasing order of their basic strength
Aniline o- Choro aniline
I II
m- Chloro aniline p- Chloro aniline
III IV
(a)I,II,III,IV. (b) I,IV,II,III
(c)II,I,IV,III. (d) I,IV,III,II
2.Among the following, weakest base is
(a) C6H5CH2NH2
(b) C6H5CH2NHCH3
(c) O2NCH2NH2
(d) CH3NHCHO
3.What is the incresing order of basicity of
I p-methylaniline II methyl aniline
III.aniline. IV.o-methylaniline
(a) I,II,III,IV
(b) I,II,IV,III
(c) IV,I,II,III
(d) II,I,,,IV,III
4.Among the following ,the weakest base is
(a) C6H5NH2
(b) p-CH3OC6H4NH2
(c) m-CH3OC6H4NH2
(d) o-CH3OC6H4NH2
ASSERTION REASON BASED QUESTIONS
1.Assertion-aniline reacts with bromine water yo form 2,4,6- tribromoaniline.
Reason-Aniline is resonance stabilized.
2.Assertion-Anilinium chloride is more acidic than NH4Cl.
Reason-Anilinium ion is resonance stabilized.
3.Assertion- Nitrobenzene is used as a solvent in Friedal-Craft reaction.
Reason-Fusion of Nitrobenzene with solid KOHgives a low yield of a mixture of o- and p- nitrogenous.
4.Assertion- Aniline does not undergo Friedal-Craft reaction.
Reason- Friedal-Craft is an electronic substitution reaction.
Multiple choice questions
1.No. of structural customers possible for th molecular formula
(a) 5
(b) 2
(c) 3
(d) 4
2.Positive carbylamine test is shown by
(a) N,N-dimethylaniline
(b) Trimethylamine
(c) N-methylaniline
(d) p- methylbenzylamine
3.The gas leaked from storage tank of union carbide plant in Bhopal gas tragedy was
(a) Phosgene
(b) Methyliso cyanate
(c) Methylamine
(d) Ammonia
4.Which of the following is more basic Than aniline
(a) Diphenylamine
(b) Triphenylamine
(c) p-Nitroaniline
(d) Benzylamine
5.Considering the basic strength of amines in aqueous solution, which one has the smallest pka value?
(a) C6H5NH2
(b) (CH3)2NH
(c) CH3NH2
(d) (CH3)3 N
SHORT ANSWER QUESTIONS I
1.It is difficult to prepare pure amines by ammonolysis of alkyl haiden.Why
2.why is the b.p.of methyl amina is less than that of methanol acid?
3.Why primary amines have higher b.p. than corresponding tertiary amines?
SHORT ANSWER QUESTIONS Il
1.Give the IUPAC names
(a) m-Toluidine
(b) n-propylamine
(c) Benzylamine
2.How will you prepare ethylamine from the following
(a) Ethyl bromide
(b) Methyl cyanide
(c) Acetamide
3.How will you convert
(a) Methylamine to ethylamine
(b) Aniline to phenylisocyanide
(c) Ethylamine to ethanol
L -14 Biomolecules
Assertion reason type questions
In these questions (Q.N.5-8) a statement of assertion followed by a statement of reason is given.Choose the correct answer out of the following choices.
a)Assertion and reason both are correct statements and reason is correct explanation for assertion.
b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
c)Assertion is correct statement but reason is wrong statement.
d)Assertion is wrong statement but reason is correct statement
1. Assertion : DNA molecules and RNA molecules are found in the nucleus of a cell.
Reason : On heating, the enzymes do not lose their specific activity.
2.Assertion- Glycine must be taken through diet.
Reason-It is an essential amino acid.
3.Assertion-Keratin is a globular protein.
Reason-Enzymes are globular proteins.
4.Assertion- Uracil occurs in DNA.
Reason RNA undergoes replication.
5.Assertion-Sucrose is a non reducing sugar.
Reason-It has glycosidic linkage.
Multiple choice questions
1. Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis
gives
(a) 2 molecules of glucose
(b) 2 molecules of glucose + 1 molecule of fructose
(c) 1 molecule of glucose + 1 molecule of fructose
(d) 2 molecules of fructose
2.The letter D in D- glucose represents
(a) Dextrorotation (b) direct synthesis © configuration
(d) optical activity
3.Which one of the following is a non reducing sugar?
( a) Glucose ( b) Sucrose
( c) Maltose ( d) Lactose
4.Glucose does not react with
( a) hydroxylamine (b) acetic an hydride
( c) sodium bisulphite (d) Br2/ H2O
5.The one letter code for the amino acid tryptophan is
( a) G ( b) V ( c) W ( d) H
Short answer type questions I
1.What are the expected products of hydrolysis of lactose?
2. How do you explain the presence of all the six carbon atoms in glucose in a straight chain?
3.What are glycosidic linkage?In which type of biomolecules are they present?
4. Describe the term D and L- configuration used for amino acids with example.
5.is a diet consisting of rice an adequate diet? Why or why not?
Short answer type II
1.What happens when glucose reacts with
( a) hydroxyl amines
(b) acetic an hydride
(c) Bromine water
2.Define the following
( a) Peptide linkage
( b) Primary structure
(c)Denaturation
3.What are essential and non- essential amino acids? Give two examples of each type.
4(i)Draw the pyranose structure of glucose and furanose structure of fructose.
(ii) What are animes?
5.Distinguish fibrous and globular proteins
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