We observe blue colour if: (a) \( \mathrm{Cu} \) electrode is placed in the \( \mathrm{AgNO}_{3}...

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We observe blue colour if:
(a) \( \mathrm{Cu} \) electrode is placed in the \( \mathrm{AgNO}_{3} \) solution
(b) \( \mathrm{Cu} \) electrode is placed in the \( \mathrm{ZnSO}_{4} \)
(c) \( \mathrm{Cu} \) electrode is placed in the dil. \( \mathrm{HNO}_{3} \)
(d) \( \mathrm{Cu} \) electrode is placed in the \( \mathrm{NiSO}_{4} \)
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