In an ionic compound A+X- , the radii of A+ and X- ions are 1.0 pm and 2.0 pm, respectively The volume of the unit cell of the crystal AX will be.

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27 pm3

64pm3

125pm3

216pm3

answer is D.

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Detailed Solution

r+râ=12=0.5 F.C.C. lattice pointCations are at octahedral void r++râ=a2=31+22 =a a=6 volume =(6)3 =216pm3

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