CBSE Academic Class XII Chemistry Sample Question Paper 2022-23
Name of the Board : Central Board of Secondary Education (CBSE)
Class : XII STD
Document Type : Sample Question Paper
Subject : Chemistry
Year : 2022-23
Website : https://cbseacademic.nic.in/SQP_CLASSXII_2022-23.html
CBSE XII Chemistry Sample Question Paper
CBSE Students can download the Chemistry Sample Question Paper for the year 2022-23 from the website of CBSE Academic.
Related / Similar Question Paper : CBSE Academic Class XII Computer Science Sample Question Paper 2022-23
Chemistry Sample Question Paper
Section A
The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark. There is no internal choice in this section.
1. The major product of acid catalysed dehydration of 1-methylcyclohexanol is
a. 1-methylcyclohexane
b. 1-methylcyclohexene
c. 1-cyclohexylmethanol
d. 1-methylenecyclohexane
2. Which one of the following compounds is more reactive towards SN1 reaction?
a. CH2=CHCH2Br
b. C6H5CH2Br
c. C6H5CH (C6H5)Br
d. C6H5CH(CH3) Br
3. KMnO4 is coloured due to:
a. d-d transitions
b. charge transfer from ligand to metal
c. unpaired electrons in d orbital of Mn
d. charge transfer from metal to ligand
4. Which radioactive isotope would have the longer half- life 15O or 19O? (Given rate constants for 15O and 19O are 5.63x 10-3 s-1 and k = 2.38 x 10-2s-1 respectively.)
a. 15O
b. 19O
c. Both will have the same half-life
d. None of the above, information given is insufficient
5. The molar conductivity of CH3COOH at infinite dilution is 390 Scm2/mol. Using the graph and given information, the molar conductivity of CH3COOK will be
a. 100 Scm2/mol
b. 115 Scm2/mol
c. 150 Scm2/mol
d. 125 Scm2/mol
*FOR VISUALLY CHALLENGED LEARNERS *5. What is the molar conductance at infinite dilution for sodium chloride if the molar conductance at infinite dilution of Na+ and Cl- ions are 51.12 × 10-4 Scm2/mol and 73.54× 10-4 Scm2/mol respectively?
a. 124.66 Scm2/mol
b. 22.42 Scm2/mol
c. 198.20Scm2/mol
d. 175.78 Scm2/mol
6. For the reaction, A +2B AB2, the order w.r.t. reactant A is 2 and w.r.t. reactant B. What will be change in rate of reaction if the concentration of A is doubled and B is halved?
a. increases four times
b. decreases four times
c. increases two times
d. no change
7. Arrange the following in the increasing order of their boiling points: A : Butanamine, B: N,N-Dimethylethanamine, C: N- Etthylethanaminamine
a. C<B<A
b. A<B<C
c. A<C<B
d. B<C<A
8. The CFSE of [CoCl6]3- is 18000 cm-1 the CFSE for [CoCl4]- will be
a. 18000 cm-1
b. 8000cm-1
c. 2000 cm-1
d. 16000 cm-1
9. What would be the major product of the following reaction? C6H5 -CH2-OC6H5 + HBr A + B
a. A= C6H5CH2OH , B= C6H6
b. A=C6H5CH2OH ,B= C6H5Br
c. A=C6H5CH3 ,B= C6H5Br
d. A=C6H5CH2Br , B= C6H5OH
10. Which of the following statements is not correct for amines?
a. Most alkyl amines are more basic than ammonia solution.
b. pKb value of ethylamine is lower than benzylamine.
c. CH3NH2 on reaction with nitrous acid releases NO2 gas.
d. Hinsberg’s reagent reacts with secondary amines to form sulphonamides.
11. Which of the following tests/ reactions is given by aldehydes as well as ketones?
a. Fehling’s test
b. Tollen’s test
c. 2,4 DNP test
d. Cannizzaro reaction
12. Arrhenius equation can be represented graphically as follows: The (i) intercept and (ii) slope of the graph are
a. (i) ln A (ii) Ea/R
b. (i) A (ii) Ea
c. (i)ln A (ii) – Ea/R
d. (i) A (ii) -Ea
*FOR VISUALLY CHALLENGED LEARNERS *12. The unit of rate constant for the reaction 2A + 2B → A2B2 which has rate = k [A]2[B] is
a. mol L-1s-1
b. s-1
c. mol L-1
d. mol-2 L2 s-1
13. The number of ions formed on dissolving one molecule of FeSO4.(NH4)2SO4.6H2O in water is
a. 3
b. 4
c. 5
d. 6
14. The oxidation of toluene to benzaldehyde by chromyl chloride is called
a. Etard reaction
b. Riemer-Tiemann reaction
c. Stephen’s reaction
d. Cannizzaro’s reaction
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