Q.

If the ionic radii of M+ and X- are about 135 pm, then expected values of metallic radii of M and X should be respectively

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a

230 and 135 pm

b

65 and 230 pm

c

135 and 135 pm

d

230 and 60 pm

answer is B.

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Detailed Solution

The radius of cation is always smaller thanrM=230pm; rX=60 pm the radius of parent atom. But the radius of anion is always larger than the radius of parent atom.

Metallic radii of M>M+ and ionic radii of X->X

Hence, 

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If the ionic radii of M+ and X- are about 135 pm, then expected values of metallic radii of M and X should be respectively