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E^(Theta) of Cu is +0.34 V while that of...

`E^(Theta)` of `Cu `is `+0.34 V `while that of `Zn `is `– 0.76 V`. Explain.

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Due to completely filled 3d and 4s orbitals Zinc forms weak metallic bond and hence its `DeltaH_("Subliation")` is very low `(131 kJ mol^(-1))` which `Cu `has high `DeltaH_("Sublim ation") (340 kJ mol^(-1))`. As `E^(Theta)` of zinc has negative value.
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  20. E^(Theta) of Cu is +0.34 V while that of Zn is – 0.76 V. Explain.

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