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A and B are two salts. A reacts both wit...

A and B are two salts. A reacts both with dil `H_2SO_4` and conc. `H_2SO_4` to give reddish brown vapours. However, B reacts only with conc. `H_2SO_4` to give similar vapours. Hence A and B are respectively

A

NaBr, `NaNO_3`

B

`NaNO_3`, NaBr

C

`NaNO_2`, NaBr

D

NaBr, `NaNO_2`

Text Solution

Verified by Experts

The correct Answer is:
C
`NaNO_2` gives `NO_2` (brown vapours) both with dil. as well as conc. `H_2SO_4`. However NaBr gives `Br_2` (brown vapours) only with conc. `H_2SO_4`. This is because halides can be decomposed only by conc `H_2SO_4` and not by dil. `H_2SO_4`
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