The 'set up', used in the laboratory, to collect sulphur dioxide, is that shown in figure :

(1) I
(2) II
(3) III
(4) IV"

Correct answer: (3) III

Explanation: SO₂ gas is sparingly soluble in water; when SO₂ gas is passed in water, it is converted to H₂SO₃.

The chemical equation for the reaction is given below:

$SO_2(g) + H_2O(l)→H_2SO_3(aq)$

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Updated on: 10-Oct-2022

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