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An aqueous solution of nitrous acid (HNO...

An aqueous solution of nitrous acid `(HNO_(2))` , free of salts , can be obtained from the reaction

A

`Ba(NO_2)_2 + H_2 SO_4 to `

B

`NaN O_2 + H_2 SO_4 overset("Cold")to `

C

`NH_4 NO_2 + H_2 SO_4 to `

D

`KNO_3 + HNO_3 to `

Text Solution

Verified by Experts

The correct Answer is:
A
Option (b) and (c) will produce `Na_2 SO_4` and `(NH_4 )_2 SO_4` which are soluble salts. Option (a) will produce `BaSO_4` which is a insoluble salt. Thus the produced `HNO_2` will be free of salt.
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