Identify the correct statement about the following reaction : 2H_2S + SO_2 → 2H_2O + S (A) H_2S is oxidising agent and SO_2 is reducing agent. (B) H_2S is reduced to sulphur. (C) SO_2 is oxidising agent and H_2S is reducing agent. (D) SO_2 is oxidised to sulphur.

ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 6

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQChemical Reactions and Equations

Identify the correct statement about the following reaction :
$2 H_{2} S + S O_{2} \to 2 H_{2} O + S$

(A) $H_{2} S$ is oxidising agent and $S O_{2}$ is reducing agent.
(B) $H_{2} S$ is reduced to sulphur.
(C) $S O_{2}$ is oxidising agent and $H_{2} S$ is reducing agent.
(D) $S O_{2}$ is oxidised to sulphur.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

Loss of hydrogen is oxidation and loss of oxygen is reduction.

Hint 2

The substance that gets reduced is the oxidising agent.

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.

$H_{2} S$ loses hydrogen to become S, so it is oxidised. It is therefore the reducing agent.
½ mark
$S O_{2}$ loses oxygen to become S, so it is reduced. It is therefore the oxidising agent. Option (C) is correct.
½ mark

Answer: $S O_{2}$ is the oxidising agent and $H_{2} S$ is the reducing agent: option (C)

Where the marks are

Selects option (C) (1 mark)

Revise the chapter

Chapter: Chemical Reactions and Equations (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Chemical Reactions and Equations, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/2/1: every question, by section.

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CBSE Class 10 Science 2024: question 6

Hints

Step-by-step solution

Revise the chapter

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