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Aavya carries out… (Class 12 Chemistry SQP 2026-27, Q6)

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ChemistryCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2026-27: question 6

From the official CBSE sample question paper for 2026-27, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQCompetency-basedChemical Kinetics

Aavya carries out hydrolysis of acetyl chloride. The reaction is represented by the following equation:

She carries out the reaction with (i) equimolar amounts of acetyl chloride and water (ii) excess of water. The rate law obeyed in the two cases will be:

  1. (A)(i) First order (ii) Second Order
  2. (B)(i) First order (ii) First order
  3. (C)(i) Second order (ii) Second order
  4. (D)(i) Second order (ii) First order

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

Open one hint at a time and try again before the next.

Hint 1

Write the rate law that includes both reactants.

Hint 2

Consider what happens to the concentration of a reactant that is present in huge excess.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (i) With comparable amounts of both reactants, the rate depends on both: rate . This is second order.

  2. (ii) With water in large excess, stays practically constant. The rate becomes , a pseudo first order reaction.

    1 mark

Answer: Option (D)

Where the marks are

  • Identifies second order for (i) and pseudo first order for (ii) (1 mark)

Revise the chapter

  • Chapter: Chemical Kinetics (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Chemical Kinetics, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.