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The discontinuity in the ionisation enthalpy values observed between
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Correct option is D
The ionisation enthalpy values as expected from the general trends, do not decrease smoothly down the group. The decrease from B to Al is associated with increase in size. The observed discontinuity in the ionisation enthalpy values between Al and Ga, and between In and Tl are due to the inability of d-and f-electrons, which have low screening effect, to compensate the increase in nuclear charge.Similar Questions
The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher BF bond dissociation energy as compared to that of CF bond is :
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