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If an element (at. Mass =50) crystalli...

If an element (at. Mass =50) crystallise in fc lattie ,with a= 0.50 nm . What is the denstiy of unit cell if it conatins `0.25%` Schottuy defects (use `N_(A) = 6xx 10^(23)`)?

A

96

B

98

C

`99.9`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Density crystal decreases due to schottky defect effective no. of atoms per unit cell in givenlattice =`4(1-(0.25)/(100))=3.99`
`rho(50xx3.99)/(6xx10^(23)(0.50xx10^(-7))^(3))=(50xx3.99)/(6xx125xx0.1)=2.66g//cm^(3)`
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