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Tests on an aqueous solution of a sodium...

Tests on an aqueous solution of a sodium salt having an anion `X^(n-)` gave the following results: anion `X^(n-) overset(K_(2)Cr_(2)O_(7) // H^(+))to "green solution + gas" overset(Pb(NO_(3))_(2))to "black precipitate"`.
Which one of the following could be `X^(n-)`:

A

`I^(-)`

B

`NO_(2)^(-)`

C

`S^(2-)`

D

`SO_(4)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
C
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