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(a) Complete the following equations: ...

(a) Complete the following equations:
(i) `Cr_2O_(7)^(2-) + 2OH^(-) to`
(ii) ` MnO_(4)^(-) + 4H^(+) + 3e^(-)`
(b) Account for the following: 
(i) Zn is not considered as a transitionelement.
(ii) Transition metals form a large number of complexes.
(iii) The `E^(0)` value for the `Mn^(3+)//Mn^(2+)` couple is much more positive than that for `Cr^(3+)//Cr^(2+)` couple.

Text Solution

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(a)(i) `Cr_2O_(7)^(2-) + 2OH^(-) to CrO_(4)^(2-) + H_2O`
(ii) `MnO_(4)^(-) + 4H^(+) + 3e^(-) to MnO_(2) + 2H_2O`
(b) (i) `Zn//Zn^(2+)` has fully filled d-orbitals.
(ii) This is due to smaller ionic sizes/higher ionic charge and availability of d-orbitals.
(iii) Because `Mn^(2+)` is more stable `(3d^5)` than `Mn^(3+) (3d^4)`.  `Cr^(+3)` is more stable due to `t_(2g)^(3)//d^(3)`, configuration.
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