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Q.

Concentrated H2SO4 cannot be used to prepare HBr from NaBr, because it:

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a

reacts slowly with NaBr

b

Disproportionates HBr

c

Oxidises HBr

d

Reduces HBr

answer is C.

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Detailed Solution

H2SO4 oxidizes Br⊖ to Br2 H2SO4+2HBr⟶SO2+Br2+2H2O
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Concentrated H2SO4 cannot be used to prepare HBr from NaBr, because it: