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(a) Account for the following : (i) Cu...

(a) Account for the following :
(i) `Cu^(+)` is unstable in an aqueous solution.
(ii) Transition metals form complex compounds.
(b) Complete the following equation:
`Cr_(2)O_(7)^(2-)+8H^(+)+3NO_(2)^(-)rarr`

Text Solution

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(ii) Becuase of smaller size of their metal ions. Their high ionic charges. Vacand d-orbital so that these orbitals can accept lone pairs of e-donated byligonads and form coordinate bond.
(b) `Cr_(2)O_(7)^(2-)+8H^(+)+3NO_(2)^(-)rarr3NO_(3)^(-)+2Cr_(3)^(+)+4H_(2)O`
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