Concentrated H2SO4 is not used to prepare HBr from KBr because it

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Concentrated H₂SO₄ is not used to prepare HBr from KBr because it

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Reduces HBr

Oxidizes HBr

Reacts too slowly with KBr

Causes disproportionation of HBr

answer is A.

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Detailed Solution

It is highly corrosive in nature and also very irritating to inhale. But conc. H₂SO₄ is not used here because HBr is a strong reducing agent and it reduces H₂SO₄ to SO₂ and oxidizes itself and forms a molecule of Br₂.

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