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Which of the… (Class 12 Chemistry SQP 2023-24, Q7)

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ChemistryCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2023-24: question 7

From the official CBSE sample question paper for 2023-24, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQChemical Kinetics

Which of the following statement is true?

  1. (A)molecularity of reaction can be zero or a fraction.
  2. (B)molecularity has no meaning for complex reactions.
  3. (C)molecularity of a reaction is an experimental quantity
  4. (D)reactions with the molecularity three are very rare but are fast.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

Molecularity is defined for which kind of reaction?

Hint 2

It can never be zero or a fraction.

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. Molecularity applies only to elementary steps; it is a whole number, it is theoretical, and termolecular steps are rare and slow.

  2. So molecularity has no meaning for a complex reaction as a whole. B is true.

    1 mark

Answer: (B)

Where the marks are

  • Selects B with the correct reasoning (1 mark)

Revise the chapter

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 2023-24: 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.