Question Detail

CHM 102 Sblock elements Objective Question
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Question

Sodium thiosulphate (Na₂S₂O₃) is formed by the reaction of sodium sulphite (Na₂SO₃) with what substance, and what are its notable uses?
Options
A Reacts with oxygen to form Na₂S₂O₃; used in disinfectants.
B Reacts with hydrochloric acid to form Na₂S₂O₃; used as a bleaching agent.
C Reacts with powder sulphur to form Na₂S₂O₃; useful in photography and iodine titrations.
Correct Answer
D Reacts with sodium hydroxide to form Na₂S₂O₃; used in fertilizers.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 24 explicitly states: 'Na₂SO₃ reacts with powder sulphur (S) to yield sodium thiosulphate (Na₂S₂O₃)' and provides the reaction: 'Na₂SO₃(aq) + S(s) → Na₂S₂O₃(aq)'. It then lists: 'Sodium thiosulphate is useful in photograghy and in iodine titrations.'

Hint

Look for the specific reaction involving sodium sulphite and its product's applications on page 24.

Question Info

Course: CHM 102
Topic: Sblock elements
Type: Objective
Difficulty: Not specified
Question 1805 of 1999
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