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Q.

Poor shielding of nuclear charge by d or f – orbital electrons is responsible for which of the following facts?

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a

The value of electron gain enthalpy is more negative for sulphur than for oxygen

b

The 1st ionization enthalpy of copper is less than that of zinc

c

Atomic radius of Nb (4d – series) is comparable to that of Ta (5d – series)

d

The 1st ionization energy for gold is greater than that of silver 

answer is A, D.

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Detailed Solution

Due to poor shielding of nuclear charge by d of f-orbital electrons, 5d-series elements have greater elective nuclear charge.

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