Which of the following is affected by catalyst ? (A) Δ H (B) Δ G (C) E_a (D) Δ S

ChemistryCBSE Class 12 · Board exam 2023, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2023: question 5

Set in the CBSE Class 12 board exam of 2023, paper 56/1/1, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQChemical Kinetics

Which of the following is affected by catalyst ?

(A) $Δ H$
(B) $Δ G$
(C) $E_{a}$
(D) $Δ S$

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 56/1/1.

Hints

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

Hint 1

A catalyst does not change the reactants or products.

Hint 2

Which quantity depends on the path taken?

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.

A catalyst provides an alternative pathway with a lower activation energy.
$Δ H$ , $Δ G$ and $Δ S$ are state functions and do not change. Option (C).
1 mark

Answer: $E_{a}$ , option (C)

Where the marks are

Catalyst lowers Ea (1 mark)

Revise the chapter

Chapter: Chemical Kinetics (notes, formulas, where marks are lost and every past question)
Topic: Arrhenius Equation and Activation Energy

Practise this chapterBoard-style questions from Chemical Kinetics, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 56/1/1: every question, by section.

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CBSE Class 12 Chemistry 2023: question 5

Hints

Step-by-step solution

Revise the chapter

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