Tests on an aqueous solution of a sodium salt having anion \( \mathrm{X}^{\mathrm{n}-} \) gave t...
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0Tests on an aqueous solution of a sodium salt having anion \( \mathrm{X}^{\mathrm{n}-} \) gave the following results
\[
\begin{array}{l}
\mathrm{X}^{\mathrm{n}-} \stackrel{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} / \mathrm{H}^{+}}{\longrightarrow} \text { green solution }+ \text { gas } \\
\text { gas } \stackrel{\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}}{\longrightarrow} \text { black ppt } \\
\mathrm{X}^{\mathrm{n}-} \text { is: }
\end{array}
\]
(a) \( \mathrm{I}^{-} \)
(b) \( \mathrm{NO}^{2-} \)
(c) \( \mathrm{S}^{2-} \)
(d) \( \mathrm{SO}_{4}^{2-} \)
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