~~)which of the metal ion forms unstable complex with cn-1)ag(1) 2)zn(2) 3)cu(2) 4)cr(2) ans is cu why so please ans conceptually with the very simple and   basic      xplntn

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When the complex is not being formed then it is in +2 state and when complex is formed it would be in +1 state which is unstable
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Cu+2 more stable in aqueous state
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Cu, because it is more stable in +2 state then in +1 state, which it is converted for to reaction with CN as carbon forum three books with nitrogen and one bond with Cu, making it rather unstable
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generally present in Cu+2 (aqueous)state but when it forms complex it attains Cu+1 state which is an unstable oxidation state of copper.
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