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Two elements ‘A’ and ‘B’ have ccp and bcc structures respectively. Ratio of molar masses of A to B  2 : 1. What will be the density ratio of B to A if the edge length ratio of A to B is 1 : 2

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answer is 3.

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Detailed Solution

dBdA=ZBMBaB3  ×   aA3ZBMBZA = 4 (ccp)  ZB = 2 (bcc)MB  :  MA=1  :  2aB  :  aA=2  :  1dBdA=2123  ×   1342dBdA= 132
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