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Q.

The decreasing order of size of isoelectronic series K+⋅Ca2+⋅Cl− and S2− is

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a

K+>Ca2>S2−>Cl-

b

K+>Ca2+>Cl−>S2−

c

Ca2−>K+>Cl->S2−

d

S2−>Cl->K+>Ca2+

answer is D.

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Detailed Solution

S2−>Cl->K+>Ca2+.As negative charge increases size increases, As positive charge increases size decreases.
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The decreasing order of size of isoelectronic series K+⋅Ca2+⋅Cl− and S2− is