Goa Board Class 12 Question Paper 2022 Chemistry

2022 XI 16 0230 Seat No.

Time : 1½ Hours FIRST TERM CHEMISTRY

Subject Code

H 4 7 0 3

Total No. of Questions : 40 (Printed Pages : 15) Maximum Marks : 40

INSTRUCTIONS : (i) The question paper consists of 40 Multiple Choice Questions,
each carrying one mark.

(ii) Each question has four choices (A), (B), (C) and (D) for its
answer, of which only one is correct.

(iii) On the OMR sheet, provided to you, for each question
number, darken with a blue or black ball point pen, Only
ONE bubble corresponding to what you consider to be the
most appropriate answer from among the four choices.

(iv) Please note that it is not possible to change the answer once
you have filled up the bubble with the ball point pen. Hence
sufficient care has to be taken while darkening the bubble.

(A) • (B) O (C) O (D) O

(A) • (B) • (C) O (D) O

(v) For each question, you will be awarded ONE mark, if you
have darkened only one bubble corresponding to the correct
answer. In all other cases, you will get zero. There is no
negative marking.

(vi) Only one OMR sheet will be provided.

(vii) In numerical problems, choose the option closest to the correct
answer.

H-4703 [FT] 1 P.T.O.

1. Doping of AgCl crystal with CdCl2 results in .......................... .

(A) Frenkel Defect

(B) Schottky Defect

(C) Impurity Defect

(D) Formation of F-centres

2. To get n-type semiconductor from silicon, it should be doped with a substance
with valency .......................... .

(A) 1

(B) 2

(C) 3

(D) 5

3. The following is a diagram of square closed packed unit cell. The packing
efficiency of the said solid is .......................... .

(A) 39.27%

(B) 52.4%

(C) 68.02%

(D) 74.05%

H-4703 [FT] 2

4. An element crystallizes in a structure having simple cubic unit cell of an

edge length 1.0 × 10–10 cm. Calculate its density if its atomic mass is

6.022 g/mol. (NA = 6.022 × 1023 mol–1)

(A) 107 g/cm3

(B) 106 g/cm3

(C) 105 g/cm3

(D) 1013 g/cm3

5. A solution of acetone in ethanol shows .......................... .

(A) the bond strength between the two molecules after mixing becomes

stronger than before

(B) an ideal behaviour in accordance with Raoult’s law

(C) a negative deviation from Raoult’s law

(D) a positive deviation from Raoult’s law

6. A raw mango when placed in a concentrated salt solution to prepare pickle

tends to shrink due to .......................... .

(A) gaining of water due to osmosis

(B) loss of water due to osmosis

(C) gaining of water due to reverse osmosis

(D) loss of water due to reverse osmosis

H-4703 [FT] 3 P.T.O.

7. In a binary mixture, if the mole fraction of one component is 0.386, then
the mole fraction of the other component will be .......................... .

(A) 0.386

(B) 0.489

(C) 0.614

(D) 0.772

8. Isotonic solutions are the solutions having the same .......................... .

(A) Surface tension

(B) Density

(C) Osmotic pressure

(D) Viscosity

9. The increase in the boiling point of a 0.05 molal solution is 0.50ºC. The molal
elevation constant of the solution is ........................... .

(A) 0.05 K kg mol–1

(B) 0.5 K kg mol–1

(C) 1 K kg mol–1

(D) 10 K kg mol–1

10. The rate law for the following reaction, A 2B — AB2 is Rate k[A]1[B]2 ,
if the concentration of B is doubled, then the rate of reaction will
.......................... .

(A) increase by 4 times

(B) decrease by 2 times

(C) increase by 2 times

(D) remain the same

H-4703 [FT] 4

11. Photochemical reactions like formation of HCl from H 2 and Cl2 are

................. .

(A) zero order reactions

(B) first order reactions

(C) second order reactions

(D) third order reactions

12. A first order reaction is half completed in 3 minutes. How long does it take

for completion of 99% of the reaction ?

2.303
(Given : 9.969; log 100 2.0000 )
0.231

(A) 1.9938 minutes

(B) 19.938 minutes

(C) 9.969 minutes

(D) 91.93 minutes

13. If the rate constant of a reaction is 0.3 × 10–4 mol–1 L s–1, the order of the

reaction is ...................... .

(A) zero order

(B) first order

(C) second order

(D) fractional order

H-4703 [FT] 5 P.T.O.

14. Consider the chemical reaction,

3NO2(g) H2O(l) 2HNO3(aq) NO(g)

The differential rate expression of the above reaction can be expressed in

terms of concentration of 3NO2(g ) , H2O(l) , 2HNO3(aq) , NO(g) . The

instantaneous rate expressions for the above equation are ....................... .

(A) Rate = –3d[NO2]/dt = –d[H2O]/dt = +2d[HNO3]/dt = +d[NO]/dt

(B) Rate = 1/3d[NO2]/dt = d[H2O]/dt = 1/2d[HNO3]/dt = d[NO]/dt

(C) Rate = –1/3d[NO2]/dt = –d[H2O]/dt = +1/2d[HNO3]/dt = +d[NO]/dt

(D) Rate = –d[NO2]/dt = –d[H2O]/dt = +d[HNO3]/dt = +d[NO]/dt

15. Chlorine water on standing loses its yellow colour due to the formation

of ........................ .

(A) HCl and O2

(B) H2 and ClO2

(C) HCl and HOCl

(D) H2 and Cl2O

16. From the following Xenon compounds, distorted octahedral structure is shown

by compound .......................... .

(A) XeOF4

(B) XeF4

(C) XeO3

(D) XeF6

H-4703 [FT] 6

17. Nitric acid is a very powerful oxidizing agent and it can attack most of the
metals except .......................... .

(A) Copper

(B) Platinum

(C) Nickel

(D) Zinc

18. Sulphur belonging to Group 16 of the periodic table has a maximum
oxidation state as .......................... .

(A) 2

(B) 4

(C) 6

(D) 8

19. The decreasing order of the thermal stability of the hydrides of Group 16
is .......................... .

(A) H2O < H2S < H2Se < H2Te < H2Po

(B) H2O > H2S > H2Se > H2Te > H2Po

(C) H2O < H2S < H2Se > H2Te > H2Po

(D) H2O > H2S > H2Se < H2Te < H2Po

20. Oleum is formed by the mixing of ..................... .

(A) H2SO4 + SO3

(B) H2SO4 + CaF2

(C) H2SO4 + H2O

(D) H2SO4 + Cu

H-4703 [FT] 7 P.T.O.

21. For the compounds 1-Bromobutane, 2-Bromo-2-methylpropane,
2-Bromobutane; the decreasing order of the boiling points will be .................. .

(A) 1-Bromobutane > 2-Bromo-2-methylpropane > 2-Bromobutane

(B) 2-Bromobutane > 2-Bromo-2-methylpropane > 1-Bromobutane

(C) 2-Bromo-2-methylpropane > 2-Bromobutane > 1-Bromobutane

(D) 1-Bromobutane > 2-Bromobutane > 2-Bromo-2-methylpropane

22. When chlorobenzene reacts with chloromethane in presence of sodium and
dry ether, the major product obtained is ......................... .

(A) Methylbenzene

(B) ethane

(C) 4-chloro-1-methylbenzene

(D) diphenyl

23. From the compounds 2-bromopropane, 2-bromo-2-methylpropane,
1-bromopropane, 2,2-dibromopropane, the compound that undergoes
substitution nucleophilic reaction with complete inversion in its configuration
is .......................... .

(A) 2-bromopropane

(B) 2-bromo-2-methylpropane

(C) 1-bromopropane

(D) 2,2-dibromopropane
24. The compound which has a asymmetric carbon atom in the following
compounds is .......................... .
CH3CH2CH2CH2Cl; CH3CH2CH(Cl) CH3; (CH3)2CH CH2(Cl); (CH3)3C Cl
(A) CH3CH2CH(Cl) CH3
(B) (CH3)2CH CH2(Cl)
(C) CH3CH2CH2CH2Cl
(D) (CH3)3C Cl

H-4703 [FT] 8

25. In the following reaction, the compounds X and Y are .......................... .

(A) and

(B) and

(C) and

(D) and

H-4703 [FT] 9 P.T.O.

26. Phenol is more acidic than ethyl alcohol because .......................... .
(A) Phenoxide ion is more resonance stabilised than phenol
(B) There is more hydrogen bonding in phenol than ethyl alcohol
(C) Ethoxide ion is less resonance stabilised than ethyl alcohol
(D) Phenol has higher boiling point than ethyl alcohol
27. For the following reaction, the product ‘P’ is .......................... .

(A)

(B)

(C)

(D)

H-4703 [FT] 10

28. The compound formed by the oxidation of butan-2-ol with CrO 3/PCC
is .......................... .
(A) Propanoic acid
(B) Butan-2-al
(C) Methanoic acid
(D) Propan-1-al
29. When an acetone is treated with an appropriate Grignard Reagent, the
product obtained is 2-methylpropan-2-ol. The Grignard reagent is .................. .
(A) ethyl magnesium iodide
(B) isopropyl magnesium iodide
(C) methyl magnesium iodide
(D) tert-butyl magnesium iodide
30. In the following reaction, the product ‘Z’ is .......................... .

(A) 2-nitrophenol
(B) 2,4-dinitrophenol
(C) 2,6-dinitrophenol
(D) 2,4,6-trinitrophenol
31. Ethanamine when treated with chloromethane forms the final product ........... .
(A) (CH3)4 N+Cl–
(B) CH3 – NH2
(C) (CH3)3 N
(D) (CH3)2 NH

H-4703 [FT] 11 P.T.O.

32. Choose the correct order of decreasing basic strength of the following amine
compounds in aqueous solution .......................... .
C6H5NH2; C2H5NH2; NH3; (CH3)2NH
(A) C6H5NH2 > C2H5NH2 > NH3 > (CH3)2NH
(B) (CH3)2NH > C2H5NH2 > NH3 > C6H5NH2
(C) C2H5NH2 > C6H5NH2 > NH3 > (CH3)2NH
(D) (CH3)2NH > NH3 > C2H5NH2 > C6H5NH2

33.

In the above reaction, the product ‘S’ is .......................... .

(A)

(B)

(C)

(D)

H-4703 [FT] 12

34. The product formed when CH3CONH2 is treated with Br2 and NaOH
is .......................... .

(A) CH3CH2NH2

(B) CH3–NH2

(C) CH3CH=N – OH

(D) CH2=N – CH3
35. Most common types of secondary structures of proteins are ........................ .

(A) -helix and -helix structures

(B) -helix and -pleated sheet structures

(C) right and left hand twisted structures

(D) globular and fibrous structures
36. The six membered cyclic structure of glucose is called .......................... .

(A) Pyranose structure

(B) Furanose structure

(C) Azetidines structure

(D) Oxetanes structure

37. Rajesh is suffering from symptoms such as fatigue, shortness of breath, weight
loss and has been diagnosed with Pernicious anaemia. The vitamin whose
deficiency causes Pernicious anaemia is .......................... .

(A) Vitamin B1

(B) Vitamin B2

(C) Vitamin B6

(D) Vitamin B12

H-4703 [FT] 13 P.T.O.

38. A popular cationic detergent used in hair conditioners is .......................... .

(A) Cetyltrimethylammonium bromide

(B) Sodium laurylsulphate

(C) Sodium dodecylbenzenesulphonate

(D) Tetramethyl ammonium chloride

39. The substance which when taken as 0.2% solution acts as an antiseptic
while the same substance when taken as 1% solution acts as a disinfectant
is .......................... .

(A) Iodine

(B) Phenol

(C) Bithionol

(D) Chlorine

40. The non-narcotic analgesic used in the prevention of heart attacks is .............. .

(A) Paracetamol

(B) Morphine

(C) Codein

(D) Aspirin

H-4703 [FT] 14

Space for rough work

H-4703 [FT] 15 P.T.O.