In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide?

Question

In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide?, $ \mathrm{Zn}^{2+}, \mathrm{Al}^{3+} $, $ A l^{3+}, C u^{2+} $, $ \mathrm{Pb}^{2+}, \mathrm{Cu}^{2+} $, $ C u^{2+}, Z n^{2+} $

MARKS App · Accepted Answer

Ion forms a coordination compound with both aqueous sodium hydroxide and ammonia and other ions forms coordination compound only with aqueous sodium hydroxide. Zinc forms $ \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right] $ coordination compound with $ \mathrm{NaOH} $ $ Z n+2 N a O H(a q) \rightarrow N a_{2}\left[Z n(O H)_{4}\right] $ Zinc forms a colorless tetraammine with the formula $ \left[Z n\left(N H_{3}\right)_{4}\right]^{2+} $ $ Z n+4 N H_{3}(a q) \rightarrow\left[Z n\left(N H_{3}\right)_{4}\right]^{2+} $ Aluminum forms complex with only aqueous sodium hydroxide $ \mathrm{N} a_{3}\left[\mathrm{Al}(\mathrm{OH})_{6}\right] $ and not with ammonia. $ A l+3 N a O H(a q) \rightarrow N a_{3}\left[A l(O H)_{6}\right] $ and $ \mathrm{Al}+\mathrm{NH}_{3}(a q) \rightarrow $ no reaction

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