MCQs ON CLASS 12 CHEMISTRY
[Prepared by:K.Sreenivasulu,PGT Chemistry,KV Idukki]
1. Which of following is not a Colligative property?
(a)Relative lowering of vapour pressure (b) Elevation in boiling point (c)Osmotic pressure
(d) Atmospheric pressure
2. If solute do not undergo neither association nor dissociation,itsVan’t Hoff factor (i) will be
(a)less than unity (b)greater than unity (c)unity (d)zero
3. Who proposed the law of independent migration of ions of an electrolyte?
(a) Raoult (b)Van’t Hoff (c)Kohlrausch(d)Hess
4. Units for rate constant (k)for all pseudo first order reactions is
(a) mol-1 L s-1 (b) mol-1 L-1 s-1 (c) mol L-1 s-1 (d)s-1
5. Standard electrode potential (E°) for Hydrogen electrode is
(a) 0.00V (b)1.00V (c) 0.01V (d) 1.01V
6. Leaching of silver and gold ores are done by
(a) NaCN/KCN (b) NaOH/Na2CO3 (c)NaCl/KCl (d)C/CO
7. Half-life of a first order chemical reaction is 5.0 x 10-3sec. What is its rate constant
(k1)value? (a)200s-1 (b) 138.6 s-1 (c) 500 s-1 (d)0.005 s-1
8. Denticity of EDTA4- is
(a) four (b)six (c)two (d)one
9. DDT is a/an
(a) pesticide (b)Insecticide(c) fungicide (d)germicide
10. Which artificial sweetener has limited use (only to cold foods)
(a) Aspartame (b) Alitame (c)Saccharin (d)Sucralose
Answers:
1.(d) 2.(c) 3.(c) 4.(d) 5.(a) 6.(a) 7.(b) 8.(b) 9.(b) 10.(a)
, MULTIPLE CHOICE QUESTIONS – CHEMISTRY CLASS XII – ORGANIC CHEMISTRY
1. The reagent which doesnot react with benzaldehyde is
A. NaHSO3 B. Phenyl hydrazine C. Fehling’s solution D. Grignard reagent
2.The IUPAC name of salicylic acid is ……………………….
3. The product formed when phenol is treated with CHCl3 and NaOH is……………………………………………
4. Two forms of D-glucopyranose are called
A. enantiomers B. anomers C. Epimers D. Diastereomers
5. Ketone upon treatment with Grignard reagent gives
A. Primary alcohol B. Secondary alcohol C. Tertiary alcohol D. Aldehyde
6. Cyanohydrin of which of the following forms lactic acid
A. HCHO B.CH3COCH3 C. CH3CHO D. CH3CH2CHO
7. On heating aniline with chloroform with ethanolic KOH, the product obtained is
………………………………….
8. Reduction of aniline with acetyl chloride in presence of NaOH produce………………
9. Which one of the following is the strongest base in aqueous solution
A. Trimethylamine B. Dimethylamine C. Aniline D. Methylamine
10. What is obtained when acetyl chloride is heated with benzene in presence of anhydrous AlCl3?
ANWSERS
1. C
2. 2-Hydroxy benzoic acid
3. Salicylaldehyde
4. B
5. C
6. C
7. Phenyl isocyanide
8. Acetanilide
9. B
10. Acetophenone
, CLASS XII- CHEMISTRY MCQ QUESTIONS
1) Among the following cells
i)leclanche cell ii)Lead storage battery
iii)Mercury cell iv)Nickel-Cadmium cell
primary cells are
a) i&iv (b) ii&iii (c)I &iii (d) ii &iv
2) The quantity of electricity in coulombs needed to reduce 1 mole
of Cr2O7 in the following reaction is
Cr2O7 +14H+ +6e- ...............>2 Cr3+ +7 H2O
a)14F b)2F C)6F d)7F
3)
A First order reaction is 50% completed in 1.26*10 14 seconds.
How much time would be needed for the completion of 75% of
the reaction
a)1.26*10 15 b)2.52*10 14s c)2.52*10 28s d) Infinite
4) Extent of adsorption of adsorbate from solution phase increases
with -------------
(a) Increase in amount of adsorbate in solution (bDecrease in
surface area of adsorbent (c) Increase in temperature
of solution (d) Decrease in amount of adsorbate in solution
5) Phenol can be distinguished from ethanl by the reaction with
(a) Br2 /H2O (b) Na
(c) CHCl3/Aq.KOH (d) Br2/Red.P4
6) For the following compounds
i)Aniline ii)P-nitro aniline iii) p—methyl aniline
the correct order of increasing basic strength
, (a) Ii< II< I (b) III<I<iii C)III<II<I d)ii<i<iii
7) The deficiency of vitamin B6 causes the disease ___________
a) Sterility b)beri-beri c) cheielog d) convulsion
8) ….(NH(CH2)-6-NH-CO-(CH2)-4-CO--)n is an
a) Addition polymer b)homopolymer c)co-polymer d)
Thermosetting polymer
9) The compound that doesnot undergo hydrolysis by SN1
mechanism
a)C6H5CH2Cl b)C6H5Cl c)CH2=CH-Cl d)C6H5-C(CH3)-Cl
10) The organic detergent that is used in hair conditioners
(a) sodium dodecyl benzene sulphonate (b)sodium lauryl sulphate
(c) cety trimethyl ammonium bromide (d) tetra methyl ammonium
chloride.
Answers:
1 .c
2 .c
3 .a
4 .a
5 ..a
6 .b
7 .b
8 .c
9 .b
10. d
[Prepared by:K.Sreenivasulu,PGT Chemistry,KV Idukki]
1. Which of following is not a Colligative property?
(a)Relative lowering of vapour pressure (b) Elevation in boiling point (c)Osmotic pressure
(d) Atmospheric pressure
2. If solute do not undergo neither association nor dissociation,itsVan’t Hoff factor (i) will be
(a)less than unity (b)greater than unity (c)unity (d)zero
3. Who proposed the law of independent migration of ions of an electrolyte?
(a) Raoult (b)Van’t Hoff (c)Kohlrausch(d)Hess
4. Units for rate constant (k)for all pseudo first order reactions is
(a) mol-1 L s-1 (b) mol-1 L-1 s-1 (c) mol L-1 s-1 (d)s-1
5. Standard electrode potential (E°) for Hydrogen electrode is
(a) 0.00V (b)1.00V (c) 0.01V (d) 1.01V
6. Leaching of silver and gold ores are done by
(a) NaCN/KCN (b) NaOH/Na2CO3 (c)NaCl/KCl (d)C/CO
7. Half-life of a first order chemical reaction is 5.0 x 10-3sec. What is its rate constant
(k1)value? (a)200s-1 (b) 138.6 s-1 (c) 500 s-1 (d)0.005 s-1
8. Denticity of EDTA4- is
(a) four (b)six (c)two (d)one
9. DDT is a/an
(a) pesticide (b)Insecticide(c) fungicide (d)germicide
10. Which artificial sweetener has limited use (only to cold foods)
(a) Aspartame (b) Alitame (c)Saccharin (d)Sucralose
Answers:
1.(d) 2.(c) 3.(c) 4.(d) 5.(a) 6.(a) 7.(b) 8.(b) 9.(b) 10.(a)
, MULTIPLE CHOICE QUESTIONS – CHEMISTRY CLASS XII – ORGANIC CHEMISTRY
1. The reagent which doesnot react with benzaldehyde is
A. NaHSO3 B. Phenyl hydrazine C. Fehling’s solution D. Grignard reagent
2.The IUPAC name of salicylic acid is ……………………….
3. The product formed when phenol is treated with CHCl3 and NaOH is……………………………………………
4. Two forms of D-glucopyranose are called
A. enantiomers B. anomers C. Epimers D. Diastereomers
5. Ketone upon treatment with Grignard reagent gives
A. Primary alcohol B. Secondary alcohol C. Tertiary alcohol D. Aldehyde
6. Cyanohydrin of which of the following forms lactic acid
A. HCHO B.CH3COCH3 C. CH3CHO D. CH3CH2CHO
7. On heating aniline with chloroform with ethanolic KOH, the product obtained is
………………………………….
8. Reduction of aniline with acetyl chloride in presence of NaOH produce………………
9. Which one of the following is the strongest base in aqueous solution
A. Trimethylamine B. Dimethylamine C. Aniline D. Methylamine
10. What is obtained when acetyl chloride is heated with benzene in presence of anhydrous AlCl3?
ANWSERS
1. C
2. 2-Hydroxy benzoic acid
3. Salicylaldehyde
4. B
5. C
6. C
7. Phenyl isocyanide
8. Acetanilide
9. B
10. Acetophenone
, CLASS XII- CHEMISTRY MCQ QUESTIONS
1) Among the following cells
i)leclanche cell ii)Lead storage battery
iii)Mercury cell iv)Nickel-Cadmium cell
primary cells are
a) i&iv (b) ii&iii (c)I &iii (d) ii &iv
2) The quantity of electricity in coulombs needed to reduce 1 mole
of Cr2O7 in the following reaction is
Cr2O7 +14H+ +6e- ...............>2 Cr3+ +7 H2O
a)14F b)2F C)6F d)7F
3)
A First order reaction is 50% completed in 1.26*10 14 seconds.
How much time would be needed for the completion of 75% of
the reaction
a)1.26*10 15 b)2.52*10 14s c)2.52*10 28s d) Infinite
4) Extent of adsorption of adsorbate from solution phase increases
with -------------
(a) Increase in amount of adsorbate in solution (bDecrease in
surface area of adsorbent (c) Increase in temperature
of solution (d) Decrease in amount of adsorbate in solution
5) Phenol can be distinguished from ethanl by the reaction with
(a) Br2 /H2O (b) Na
(c) CHCl3/Aq.KOH (d) Br2/Red.P4
6) For the following compounds
i)Aniline ii)P-nitro aniline iii) p—methyl aniline
the correct order of increasing basic strength
, (a) Ii< II< I (b) III<I<iii C)III<II<I d)ii<i<iii
7) The deficiency of vitamin B6 causes the disease ___________
a) Sterility b)beri-beri c) cheielog d) convulsion
8) ….(NH(CH2)-6-NH-CO-(CH2)-4-CO--)n is an
a) Addition polymer b)homopolymer c)co-polymer d)
Thermosetting polymer
9) The compound that doesnot undergo hydrolysis by SN1
mechanism
a)C6H5CH2Cl b)C6H5Cl c)CH2=CH-Cl d)C6H5-C(CH3)-Cl
10) The organic detergent that is used in hair conditioners
(a) sodium dodecyl benzene sulphonate (b)sodium lauryl sulphate
(c) cety trimethyl ammonium bromide (d) tetra methyl ammonium
chloride.
Answers:
1 .c
2 .c
3 .a
4 .a
5 ..a
6 .b
7 .b
8 .c
9 .b
10. d
