(a) Account for the following:
(i) $C u^{+}$ is unstable in an aqueous solution.
(ii) Transition metals form complex compounds.
(b) Complete the following equations:
$C r_{2} O_{7}^{2 -} + 8 H^{+} + 3 N O_{¯ 2} \to$

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Solution

(a)
(i) $C u^{+}$ gets oxidized in aqueous solution to get stable configuration $C u^{2 +}$ .
(ii) Since, transition metals have unfilled or partially filled d-orbital thus, to satisfy its octate it forms complex compounds.
(b) $C r_{2} O_{2}^{- 7} + 8 H^{+} + 3 {N O_{3}}^{-} ⟶ 2 {C r}_{3}^{+} + 4 H_{2} O + 3 {N O_{3}}^{-}$

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