Q.
The correct order of the size is
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a
Ca2+ > K+ >Ar > Cl− > S2−
b
K+ > Ca2+ > Cl− > Ar > S2−
c
S2− >Cl− > Ar >K+ > Ca2+
d
S2− >Ar > Cl− >Ca2+ > K+
answer is C.
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Detailed Solution
All the species are isoelectronic therefore the greater the nuclear charge the lesser will be the size.As -ve charge increases size increases and as +ve charge increases size decreases.
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