A and B are two salts. A with dilute HCl and B with conc. H_2SO_4 react to give reddish brown vapours, hence A and B respectively are:

JEE Main Chemistry question

A and B are two salts. A with dilute HCl and B with conc. react to give reddish brown vapours, hence A and B respectively are:

(A)NaBr,
(B),NaBr
(C)NaBr,
(D),NaBrCorrect

Answer: (D)

Solution

with dilute HCl releases reddish-brown gas (via disproportionation of the liberated unstable nitrous acid), matching salt A, while NaBr with concentrated is oxidised to

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Question ID VK-137941