CBSE Class 12 2025 Chemistry 56-7-3 Question Paper Set-3: Download Solutions with Answer Key

CBSE CLASS XII Questions

• 1.

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

  • \(0.5 \times 10^{-4} \, \text{s}^{-1}\)
    
  • \(5.0 \times 10^{-4} \, \text{s}^{-1}\)
    
  • \(0.5 \times 10^{-5} \, \text{s}^{-1}\)
    
  • \(0.5 \times 10^{-3} \, \text{s}^{-1}\)
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• 2.

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

  • Reimer-Tiemann reaction
    
  • Wolff-Kishner reduction
    
  • Aldol condensation
    
  • Stephen reaction
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• 3.

  Benzoic acid to Benzene

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• 4.

  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.
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• 5.

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

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• 6.

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

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