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a
Directly proportional to effective nuclear charge
b
Directly proportional to square of effective nuclear charge
c
Inversely proportional to effective nuclear charge
d
Inversely proportional to square of effective nuclear charge.
answer is C.
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Detailed Solution
Ionic radius in the nth orbit is given by rn=n2az or rn ∝ 1Zwhere n is principal quantum no., a0 is Bohr's radius of hydrogen atom and Z is the effective nuclear charge.