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Q.

Which of the following has maximum value of cation/anion radius ratio?

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a

KCI

b

MgCl2

c

CaF2

d

NaCI

answer is C.

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Detailed Solution

Among the three options KCl, NaCl and MgCl2 , the size of anion is same. So larger the cation, larger will be the cation/anion ratio i.e., KCI will have-larger cation/anion ratio among the three. So, we left with two options KCI and CaF2. Among these two CaF2 will have maximum value of cation/anion ratio because decrease in ionic radii of anion from Cl- to F- does not overcome the effect of decrease in ionic radii of cation from K+ to Ca2+.

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