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Account for the following: (a) CuCl_(2) is more stable than Cu_(2)Cl_(2). (b) Atomic radii of 4d and 5d series elements are nearly same. (c) Hydrochloric acid is not used in permanganate titrations. |
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Answer» Solution :(a) `CuCl_(2)` is more stable than `Cu_(2)Cl_(2)`. This is because in `CuCl_(2)`, Cu is in + 2 oxidation state which is more stable due to HIGH hydration enthalpy COMPARED to `Cu_(2)Cl_(2)` in which Cu is in + 1 oxidation state. (b) Atomic radii of 4d and 5d series elements are NEARLY same. This happens because of lanthanide contraction. (c) Hydrochloric acid is not used in permanganate titration. This is because hydrochloric acid is oxidised to chlorine. `2HCl+O to Cl_(2)+H_(2)O` |
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