Objective question in Solid state

JEE Main 2015 Answers › Physical Chemistry questions › Objective question in Solid state

3 metals A (270), B (80) & C (10) crystallize in simple cubic, face centered cubicÂ and body centered cubic (bcc) phases respectively with unit cell 3, 2 and 1 Ã
respectively. The densities of A:B:C are in the ratio of:
a) 3:2:1 b) 54:68:74 c) 1:1:1 d) 1:2:4

#Chemistry #Physical Chemistry #Solid state

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1 Answers

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student ·2014-05-01 08:26:48

I have a doubt in this question,

according to my calculation,

we know
d = Z.M. / (a³ * N_a)
then, d_a:d_b:d_c
=(1*270/3³):(4*80/2³):(2*10/1³)[since N_a gets cancelled]
=10:40:20
=1:4:2

but this was not there in the options.
where am i going wrong?

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