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State reasons for the following: (i) Cu (1) ion is not stable in an aqueous solution. (ii) Unlike Cr^(3+), Mn^(2+), Fe^(3+) and the subsequent other M^(2+) ions of the 3d series of elements, the 4d and 5d series metals generally do not form stable cationic species. |
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Answer» Solution :(i) Cu (I) ion does not EXHIBIT sufficiently NEGATIVE value of enthalpy of hydration and it proportionates into 0 and +2 oxidation STATES of Cu. `2Cu^(+)toCu^(2+)+Cu` (II) 4d and 5d series transition metals have greater enthalpies of atomisation. Thus, there are strong metal-metal interactions between them. This is the REASON why they do not form stable cationic species. |
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