Chemistry - Solid State Question with Solution | TestHub

ChemistrySolid StateGeneralEasy2 minPYQ_2020
ChemistryEasysingle choice

A metal crystallizes into two cubic systems-face centred cubic (fcc) and simple cubic (SC), whose unit cell lengths are 4.5 and 1.5 A o respectively. Calculate the ratio of densities of face centred cubic and Simple cubic.

Options:

Answer:
A
Solution:

face centred cubic unit cell length =4.5 A o
Simple cubic unit cell length =1.5 A o
Density in face centred cubic=n1×atomic   weightV1×Avogadro   number
Density simple cubic (SC)=n2×atomic    massV2×Avogardro   number
DfccDbcc=n1n2×V2V1
n1for face centred cubic = 4; AlsoV1=a3=4.5×10-83
n2for simple cubic = 1; AlsoV2=a3=1.5×10-83
DfccDsc=4×(1.5×10-8)31×(4.5×10-8)3=0.15

Stream:JEESubject:ChemistryTopic:Solid StateSubtopic:General
2mℹ️ Source: PYQ_2020

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