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Class 12 – Chemistry

Revision Sample Papers

CBSE Examination – 2020

List of Sample Papers

S. No. Paper

Code Contents

1 BSP 1 Climb’s Board-Level Chemistry Sample Paper 1




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1 | P a g e Code: Chem_XII - 1

Time allowed: 3 hours Maximum Marks : 70

General Instructions

a) All questions are compulsory.

b) Section A: Q.no. 1 to 20 are very short answer questions (objective type) and carry 1 mark each.

c) Section B: Q.no. 21 to 27 are short answer questions and carry 2 marks each.

d) Section C: Q.no. 28 to 34 are long answer questions and carry 3 marks each.

e) Section D: Q.no. 35 to 37 are also long answer questions and carry 5 marks each.

f) There is no overall choice. However an internal choice has been provided in two questions of one mark,

two questions of two marks, four questions of three marks and all the three questions of five marks

weightage. You have to attempt only one of the choices in such questions.

g) Use log tables if necessary, use of calculators is not allowed.

Section - A

1. The correct order of increasing Boiling Point of the following compounds is –

a) (CH3)2 N < C2H5OH < C2H5NH2

b) (CH3)2 N < C2H5NH2 < C2H5OH

c) C2H5OH < C2 H5 NH2 < (CH3)2N

d) C2H5OH < (CH3)2N < C2H5NH2

1

2. Assertion: Medicines are more effective in colloidal state

Reason: Colloidal particles scatter light

a) Both assertion and reason are correct statements, and reason is the correct explanation of the

assertion.

b) Both assertion and reason are correct statements, but reason is not the correct explanation of the

assertion.

c) Assertion is correct, but reason is wrong statement.

d) Assertion is wrong, but reason is correct statement.

1

OR

The dispersion medium, in an emulsion is ___________ and in a gel is ________. (fill in the blanks)

3. Assertion: CN- is an Ambident nucleophile

Reason: It contains two nucleophilic centers


assertion.


Board Level Papers – CBSE 2020

Chemistry Class: XII

Developed on the basis of CBSE Paper Code – 56/1/1 (2019)

Please check that this question paper contains 7 printed pages.

Code number given on the right hand side of the question paper should be written on the title page of the answer-

book by the candidate.

Please check that this question paper contains 37 questions.

Please write down the Serial Number of the question before attempting it.

15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m.

From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the

answer-book during this period.

BSP - 01


assertion.



4. Basic structural difference between Glucose and Fructose is …

a) Glucose contains aldehydic group and fructose contains ketonic group

b) Glucose contains 6 carbon atom ring whereas fructose contains 5 carbon atom ring

c) Glucose exist in D and L form whereas fructose exist in L form only

d) Glucose exists in α & β forms whereas fructose exists as ‘α’ form only.

OR

Products obtained after hydrolysis of Lactose are-

a) α – D Glucose & α – D Galactose

b) α – D Glucose & β – D Galactose

c) α – D Galactose & β – D Glucose

d) β – D Glucose & β D - Galactose

5. The method used to obtain semiconductors of high purity is _________. (Fill in the blank)

6. ____________ is used to obtain low boiling metals. (Fill in the blank)

7. Match the column A with the method in Column B used to obtain the metal

Column A Column B

(A) Impure Ni to pure Ni (i) Self reduction

(B) Zinc blende to Zn (ii) Leaching

(C) [Ag (CN)2]- to Ag (iii) Vapour phase refining

(D) Cu2S to Cu (iv) Carbon reduction

a) (A) - (ii), (B) – (iii), (C) – (i), (D) – (iv)

b) (A) - (iii), (B) – (iv), (C) – (i), (D) – (ii)

c) (A) - (iii), (B) – (iv), (C) – (ii), (D) – (i)

d) (A) - (i), (B) – (iv), (C) – (ii), (D) – (iii)

8. Match the chemical to their properties:

Column A Column B

(A) Bithinol (i) Drug commonly used in sleeping pills

(B) Alitame (ii) A detergents used in tooth paste

(C) Chlordiazepoxide (iii) A high potency artificial sweetner

(D) Sodium alkyl benzene Sulphonate (iv) Imparts antiseptic property to soap

a) (A) - (iii), (B) – (iv), (C) – (ii), (D) – (i)

b) (A) - (iii), (B) – (iv), (C) – (i), (D) – (ii)

c) (A) - (iv), (B) – (iii), (C) – (ii), (D) – (i)

d) (A) - (iv), (B) – (iii), (C) – (i), (D) – (ii)

9. IUPAC name of the given compound is : Cl-C6H5–SO3H

a) 1 – Chloro –4- sulphonyl benzene

b) 1 – Sulphonyl –4- chloro benzene

c) 4 – Chloro benzene sulphonic acid

d) 4– Sulphonylchloro benzene

10. On the basis of IUPAC norms the formulae for Pentaaminenitrito–o–cobalt (III) chloride is ….

a) 〔Co (NH3)5 ONO〕Cl2

b) 〔Co (NH3)5 NO2〕Cl2

c) 〔Co (NH3)5 Cl3〕NO2

d) 〔Co (NH3)5Cl ONO〕Cl2


11. The most stable complex is ….

a) 〔CO F6〕3-

b) 〔CO(C2O4)3〕3-

c) 〔CO(H2O)6〕3+

d) 〔CO(NH3)6〕3+

12. [Co(en)3]3+ is an inner orbital complex as well as diamagnetic in nature. (State whether the statement is True

or False)

13. Using IUPAC norms the formula for Potassium tetracyanidonickelate(II) is _____________. (Give the correct

formula)

14. Assertion : Magnesium hydroxide is better antacid than Na2CO3.

Reason: Mg(OH)2 is more soluble than Na2CO2.


assertion.


assertion.



15. Match the Columns:

Column - A Column – B

(A) Broad Spectrum Antibiotic (i) Tincture of Iodine

(B) Disinfectant (ii) Aspirin

(C) Analgesic (iii) Chloromphenicol

(D) Antiseptic (iv)1% phenol Solution

a) (A) - (iii), (B) – (ii), (C) – (iv), (D) – (i)

b) (A) - (iii), (B) – (iv), (C) – (ii), (D) – (i)

c) (A) - (ii), (B) – (iii), (C) – (i), (D) – (iv)

d) (A) - (ii), (B) – (i), (C) – (iii), (D) – (iv)

16. Match the Reactants with the products form:

Column - A Column – B

(A) C6H5COCl NH2NH2/KOH

Ethlene glycol

(i) Hell Volhards Zelinskey Reaction

(B) C6H5COCl H2/Pd

BaSO4, S

(ii) Rosenmund reduction reaction

(C) CH3CH(CH3)COOH Br2/ Red P

H3O+

(iii) Wolff Kishner reduction reaction

(D) CH3NH2 CHCl3

KOH

(iv) Carbyl Amine reaction

a) (A) - (iii), (B) – (ii), (C) – (i), (D) – (iv)

b) (A) - (iii), (B) – (i), (C) – (ii), (D) – (iv)

c) (A) - (ii), (B) – (i), (C) – (iii), (D) – (iv)

d) (A) - (ii), (B) – (iii), (C) – (i), (D) – (iv)

17. During Denaturation of protein, ______________ type of structure of proteins remains intact. (Fill in the

blank)


18. Which of the following order is correct?

a) H2S <H2O <H2Se < H2Te (acidic strength)

b) HF< HCl< HBr< HI (bond dissociation enthalpy)

c) C2H5NH2 < (C2H5)2NH < (C2H5)3N (basic strength in gaseous phase )

d) (CH3)3N > (CH3)2NH > CH3NH2 (solubility in water)

19. SN1 reaction proceeds with inversion of configuration & SN2 reaction proceeds with racemisation.

(State whether the statement is True or False)

20. Antinoids show variable oxidation states due to large differences in energies of 5f, 6d and 7s orbitals.

(State whether the statement is True or False)

Section – B

21. Write two differences between an ideal solution and a non-ideal solution.

OR

State Henry’s law and write its two applications.

22. State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution

which obeys Raoult’s law at all concentrations.

23.

24. When MnO2 is fused with KOH in the presence of KNO3 as and oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises KI to compound (C) whereas an acidified solution of compound (B) oxidises KI to (D). Identify (A), (B) and (C).

25. Differentiate between the following :

(i) Amylose and Amylopectin

(ii) Peptide linkage and Glycosidic linkage

(iii) Fibrous proteins and Globular proteins

OR

Write chemical reactions to show that open structure of D-glucose contains the following :

(i) Straight chain

(ii) Five alcohol groups

(iii) Aldehyde as carbonyl group

26.


27.

OR

Section – C

28.

29.

30.


31.

32.

OR

33.

34.

Section – D

35.

OR

(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO4 and ZnSO4 until 2.8 g of Fe deposited at the cathode of cell X. How long did the current flow? Calculate the mass of Zn deposited at the cathode of cell Y.

(Molar mass: Fe = 56 g mol-1 Zn = 65.3 g mol-1 , 1F = 96500 C mol-1 )


36.

37. a) Give reasons for the following-

(i) Sulphur in vapour state show paramagnetic behaviour.

(ii) Ka2 << Ka1 for H2SO4 in water.

(iii) Ozone is thermodynamically less stable than oxygen

b) Write the name of the gas released when conc. H2SO4 is added to-

(i) Cu

(ii) S

c) Write balanced equations for the following processes:

(i) XeF2 undergoes hydrolysis

(ii) MnO2 is heated with conc HCl

OR

a) (i) Write the disproportionate reaction of Cl2

(ii) Draw the structure of XeF4

b) Account for the following:

(i) Although fluorine has less negative electron gain enthalpy, yet it is a stronger oxidising agent.

(ii) Acidic character of SO3 is more than SO2 in group 16.

c) Write chemical reaction to test Sulphur dioxide gas. Write chemical reaction involved.

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We are pleased to release our special series ... - CBSE Board › wp-content › uploads › 2020 › ... · We are pleased to release our special series of Board Level Chemistry