The aqueous solution of which salt is coloured: (a) \( \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{...

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The aqueous solution of which salt is coloured:
(a) \( \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2} \)
(b) \( \mathrm{LiNO}_{3} \)
(c) \( \mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2} \)
(d) Potash alum
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