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Q.

A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is AXBY, then the value of x + y is in option.

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a

2

b

3

c

4

d

5

answer is B.

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Detailed Solution

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No. of atoms of ‘B’ per unit cell in ccp = 4
No. of ‘A’ atoms = 1/3 (8) = 8/3
A : B = 8/3 : 4 = 2 : 3 = x : y
x + y = 2 + 3 = 5

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