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The compounds of Zn, Cd and Hg are usually white. (ii) A dark blue precipitate is formed when NaOH solution is added to CuSO_(4) |
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Answer» Solution : In the compounds of zinc metals, `M^(2+)` ions possess the penultimate d-orbitalsdoubly OCCUPIED, i.e. `(n-1)d^(10)` configuration. There is no d-d transition. Hence the compounds of zinc metals are colourless (i) NaOH reacts with `CuSo_(4)` when dark blue PRECIPITATE of `Cu(OH)_(2)` is FORMED. This precipitate of heating forms CuO which is BLACK in colour. Hence, the colour darkens on heating `CuSO_(4) + 2NaOH to Cu(OH)_(2) + Na_(2) SO_(4)` `Cu(OH)_(2) tounderset(Black)(CuO) + H_(2)O` |
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