\( \mathrm{Cu}^{2+} \) and \( \mathrm{Cd}^{2+} \) are detected in a mixture of their solution by....

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\( \mathrm{Cu}^{2+} \) and \( \mathrm{Cd}^{2+} \) are detected in a mixture of their
\( \mathrm{P} \)
solution by using:
(1) Conc. \( \mathrm{HNO}_{3} \) and \( \mathrm{H}_{2} \mathrm{~S} \)
(2) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right) \)
(3) \( \mathrm{KCN} \) and \( \mathrm{H}_{2} \mathrm{~S} \)
(4) \( \mathrm{HCl} \) and \( \mathrm{H}_{2} \mathrm{~S} \)


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