27. Which one of the following ionic species will impart colour to an aqueous solution? [1998]
(a) $Ti^{4+}$
(b) $Cu^{+}$
(c) $Zn^{2+}$
(d) $Cr^{3+}$
Show Answer
Solution:
(d) We know that chromium (III) salts dissolve in water to give violet solution. The violet colour is due to the hydrated chromium (III) in $[Cr(H_2 O)_6]^{3+}$.
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