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Irregular trend in the standard reduction potential value of first row transition elements is due to

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Regular variation of sublimation enthalpies

Irregular variation of sublimation enthalpies

Increase in no. of unpaired electrons

Regular variation of first and second ionisation enthalpies

answer is B.

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Detailed Solution

There is no regular trend in the $E^{o} (M^{2 +} / M)$ values because of irregular variation of ionization energies and sublimation energies of the atoms of the members of the transition series

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