1.

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-):

Answer»

`I^(-)`
`NO_(2)^(-)`
`S^(2-)`
`SO_(4)^(2-)`

ANSWER :C


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