Consider the following reactions : \( X( \) aq. \( ) \stackrel{\mathrm{K}_{4}\left[\mathrm{Fe}(\...

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Consider the following reactions :
\( X( \) aq. \( ) \stackrel{\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]}{\longrightarrow} \) Chocolate brown ppt.
\( X(a q.) \stackrel{\mathrm{AgNO}_{3}}{\longrightarrow} \) White ppt. (insoluble in dil. \( \mathrm{HNO}_{3} \) )
Then ' \( X \) ' will be :
(a) \( \mathrm{ZnSO}_{4} \)
(b) \( \mathrm{CuCl}_{2} \)
(c) \( \mathrm{FeSO}_{4} \)
(d) \( \mathrm{FeCl}_{3} \)
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