CBSE Class 12 Chemistry Question Paper 2026 with Solutions PDF: Answer Key & Exam Analysis (All Sets)

1.

For a reaction : \( N_2 + 3H_2 \rightarrow 2NH_3 \), the rate of reaction with respect to \( NH_3 \) is

• \( +\frac{1}{3} \frac{\Delta [NH_3]}{\Delta t} \)
  
• \( -\frac{1}{2} \frac{\Delta [NH_3]}{\Delta t} \)
  
• \( +\frac{1}{4} \frac{\Delta [NH_3]}{\Delta t} \)
  
• \( +\frac{1}{2} \frac{\Delta [NH_3]}{\Delta t} \)

2.

Benzoic acid to Benzene

3.

Write IUPAC names of the following coordination compounds:
(i) \( [Ag(NH_3)_2][Ag(CN)_2] \)
(ii) \( K_3[Fe(C_2O_4)_3] \)

4.

What happens when acidic solution of potassium permanganate is allowed to stand for sometime ? Give the equation involved. What is this type of reaction called ?

5.

Assertion (A): D(+)-Glucose is dextrorotatory in nature.
Reason (R): (+) represents dextrorotatory nature and D represents its configuration.

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  
• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  
• Assertion (A) is true, but Reason (R) is false.
  
• Assertion (A) is false, but Reason (R) is true.

6.

Assertion (A): Highest oxidation state of Mn is +7 in most of the transition elements.
Reason (R): Transition metals exhibit variable oxidation states.

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  
• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  
• Assertion (A) is true, but Reason (R) is false.
  
• Assertion (A) is false, but Reason (R) is true.

7.

How will you confirm the presence of five –OH groups in a glucose molecule, which are attached to different carbon atoms?

8.

Calculate emf of the following cell at 298 K: \[ \text{Cr(s)} \, | \, \text{Cr}^{3+} (aq) \, (0.1\, M) \; || \; \text{Fe}^{2+} (aq) \, (0.01\, M) \, | \, \text{Fe(s)} \] Given: \[ E^\circ_{\text{Cr}^{3+}/\text{Cr}} = -0.74 \, V, \quad E^\circ_{\text{Fe}^{2+}/\text{Fe}} = -0.44 \, V, \quad \log 10 = 1 \]

9.

Which of the reactions is used in the conversion of a ketone into hydrocarbon?

• Reimer-Tiemann reaction
  
• Wolff-Kishner reduction
  
• Aldol condensation
  
• Stephen reaction

10.

Name the cell which was used in the Apollo space programme for providing electrical power.

11.

Half-life (\( t_{1/2} \)) of a first order reaction is 1386 s. The value of rate constant is:

• \(0.5 \times 10^{-4} \, \text{s}^{-1}\)
  
• \(5.0 \times 10^{-4} \, \text{s}^{-1}\)
  
• \(0.5 \times 10^{-5} \, \text{s}^{-1}\)
  
• \(0.5 \times 10^{-3} \, \text{s}^{-1}\)

12.

The rate for the following reaction is given by: \[ A + B \rightarrow C, \quad \text{Rate} = k[A][B]^2 \] How is the rate affected if we double the concentration of B?

13.

Consider the following reaction and identify A and B: \[ CH_3Cl + NaI \xrightarrow{\text{dry acetone}} A + B \]

• A = CH\(_3\)I, B = NaCl
  
• A = CH\(_3\)OH, B = NaCl
  
• A = CH\(_3\)CHO, B = NaCl
  
• A = C\(_2\)H\(_6\), B = CH\(_3\)I

14.

Following reaction takes place in one step :
\( 2A + B \rightarrow 2C \)
How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?

15.

Which of the following Grignard Reagent will be used to prepare cyclohexylmethanol when treated with methanal?

• A
• B
• C
• D