Assertion :Conc. $H_{2} S O_{4}$ can not be used to prepare pure HBr from NaBr. Reason: It reacts slowly with NaBr

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
HBr cannot be prepared by the action of conc. $H_{2} S O_{4}$ on NaBr because $H_{2} S O_{4}$ is an oxidising agent and $H B r$ is strong reducing agent. $HBr$ reduces sulphuric acid to sulphur dioxide and itself is oxidised to bromine. Hence, HBr is prepared by heating NaBr with conc. phosphoric acid. Same is true for the preparation of HI. Thus, assertion is correct but reason is incorrect.
$N a B r + H_{2} S O_{4} \to N a H S O_{4} + H B r H_{2} S O_{4} + 2 H B r \to S O_{2} + B r_{2} + 2 H_{2} O$

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Assertion :Conc. H2SO4 can not be used to prepare pure HBr from NaBr. Reason: It reacts slowly with NaBr

Assertion :Conc. $H_{2} S O_{4}$ can not be used to prepare pure HBr from NaBr. Reason: It reacts slowly with NaBr