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Which of the following statements is/are...

Which of the following statements is/are wrong?

A

van der Waal's radius of iodine is more than its covalent radius

B

All isoelectronic ions belong to same period of the periodic table

C

`I.E_(1)` of N is higher than that of O while `I.E_(2)` of O is higher than that of N

D

The electron gain enthalpy of N is almost zero while that of P is `74.3KJ//"mol"`

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The correct Answer is:
B
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