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A mixture is known to contain NO(3)^(-) ...

A mixture is known to contain `NO_(3)^(-) " and" NO_(2)^(-)`. Before performing ring test for `NO_(3)^(-)`, the aqueous solution should be made free of `NO_(2)^(-)`. This is done by heating aqueous extract with :

A

conc. `HNO_(3)`

B

dil `HNO_(3)`

C

urea

D

zinc dust

Text Solution

Verified by Experts

The correct Answer is:
C
`NO_(2)^(-)+H^(+) to HNO_(2)`
`CO(NH_(2))_(2)+HNO_(2)to 2N_(2) uarr + CO_(2) uarr + 3H_(2)O`
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