(A) Conc.H₂SO₄ reacts with KCl to give HCl gas
(R) HCl cannot be oxidised by conc.H₂SO₄

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

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

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

KCl and H₂SO₄ react to give only HCl but not chlorine Cl₂ gas, whereas KI and H₂SO₄ react to liberate iodine (free halogen).
This is because HBr and HI are powerful oxidising agents, and they are also thermodynamically less stable than HCl. Thus easily dissociates to H₂ and X₂ (X=I/Br) at higher temperatures. And, conc. H₂SO₄ is a fairly effective oxidising agent.
The reaction involved is:
2HX+H₂SO₄→SO₂+X₂+2H₂O for X=I/Br
HCl is only a mild reducing agent, and it is not easily oxidised to free chlorine gas by conc.H₂SO₄.