(A) Sulphur dioxide acts as antichlor
(R) In presence of charcoal SO₂ combine with Cl₂ to form sulphuryl chloride

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

(A) Sulphur dioxide acts as an antichlor:

This statement is correct. An antichlor is a substance that prevents the formation of excess chlorine or removes excess chlorine from a reaction mixture. Sulphur dioxide acts as an antichlor because it can reduce excess chlorine to chloride ions, thereby preventing the over-oxidation of the desired product. For example, in the bleaching of textiles, SO₂ is used as an antichlor to prevent damage to the fabric by excess chlorine.

(R) In the presence of charcoal, SO₂combines with Cl₂to form sulphuryl chloride:

This statement is incorrect. Sulphuryl chloride (SO₂Cl₂) is not formed by the combination of SO₂ and Cl₂ in the presence of charcoal. Sulphuryl chloride is usually prepared by the reaction of SO₂ with dry HCl gas in the presence of a catalyst such as activated charcoal.

The reaction between SO₂ and Cl₂in the presence of charcoal is not a known reaction. Charcoal can be used as a catalyst for some reactions, but it does not necessarily promote the combination of SO₂ and Cl₂ to form SO₂Cl₂. Therefore, statement (R) is incorrect.

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