CBSE Class 12 Chemistry Sample Paper 2024

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. Which of the following solutions will have the highest conductivity at 298 K?
(a) 0.01 M HCl solution
(b) 0.1 M HCl solution
(c) 0.01 M CH₃COOH solution
(d) 0.1 M CH₃COOH solution
Answer : B

2.

Identify A and B:
(a) A = 1-phenylethanal , B = acetophenone
(b) A = Benzophenone B = formaldehyde
(c) A= Benzaldehyde , B = Acetophenone
(d) A = Benzophenone , B = Acetophenone
Answer : C

3. The vitamins which can be stored in our body are:
(a) Vitamin A, B, D and E
(d) Vitamin A, C, D and K
(c) Vitamin A, B, C and D
(d) Vitamin A, D, E and K
Answer : D

4. What is IUPAC name of the ketone A, which undergoes iodo form reaction to give CH₃CH= C(CH₃)COONa and yellow precipitate of CHI₃ ?
(a) 3-Methylpent-3-en-2one
(b) 3-Methylbut-2-en- one
(c) 2, 3-Dimethylethanone
(d) 3-Methylpent-4-one
Answer : A

5. Which of the following is not correct?
(a) In haloarenes, the electron pairs on halogen atom are in conjugation with π-electrons of the ring.
(b) The carbon-magnesium bond is covalent and non-polar in nature .
(c) During SN1 reaction, the carbocation formed in the slow step being sp² hybridised is planar.
(d) Out of CH₂ = CH-Cl and C₆H₅CH₂Cl, C₆H₅CH₂Cl is more reactive towards SN¹ reaction
Answer : B

6. Match the properties with the elements of 3d series:
(i) lowest enthalpy of atomisation                                                      (p) Sc
(ii) shows maximum number of oxidation states                               (q) Mn
(iii) transition metal that does not form coloured compounds            (r) Zn
                                                                                                          (s) Ti
(a) (i) (r), (ii) (q), (iii) (p)
(b) (i) (r), (ii) (s), (iii) (p)
(c) (i) (p), (ii) (q), (iii) (r)
(d) (i) (s), (ii) (r), (iii) (p)
Answer : A

7. Which of the following statement is true?
(a) molecularity of reaction can be zero or a fraction.
(b) molecularity has no meaning for complex reactions.
(c) molecularity of a reaction is an experimental quantity
(d) reactions with the molecularity three are very rare but are fast.
Answer : B

8. In which of the following solvents, the C₄H₈NH₃⁺X^– is soluble;
(a) ether
(b) acetone
(c) water
(d) bromine water
Answer : C

9. Which of the following observation is shown by 2 -phenyl ethanol with Lucas Reagent?
(a) Turbidity will be observed within five minutes
(b) No turbidity will be observed
(c) Turbidity will be observed immediately
(d) Turbidity will be observed at room temperature but will disappear after five minutes.
Answer : B

10. If the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M, the rate constant for the reaction if it follows zero - order kinetics is:
(a) 0.00625 molL^-1s^-1
(b) 0.00625 s^-1
(c) 0.00578 molL^-1s^-1
(d) 0.00578 s^-1
Answer : A

11. Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst
(a) Due to the activation of benzene ring by the methoxy group.
(b) Due to the de-activation of benzene ring by the methoxy group.
(c) Due to the increase in electron density at ortho and para positions
(d) Due to the formation of stable carbocation.
Answer : A

Please refer to attached file for CBSE Class 12 Chemistry Sample Paper 2024