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Q.

Molybdenum (At. mass = 96g mol-l) crystallizes as bcc crystal. If density of crystal is 10.3 g/cm3, then radius of Mo atom is (use NA= 6 x 1023mol-1) .

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a

111 pm

b

none of these

c

314 pm

d

135.96 pm

answer is C.

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Detailed Solution

d=zMWNAa3Z=2,Mw=96,d=10.3g/cm33a=4r=3a4a3=2×9610.3×6.023×1023=3.14×10−8r=3a4=3×3.14×10−84=135.96pm

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