Engineer & Medical

Solid State question bank (Chemistry)

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Q1.

The correct relationships between unit cell edge length ‘ $a$ ’ and radius of sphere ‘ $r$ ’ for face-centred and body-centred cubic structures respectively are:

(A)

2 \sqrt{2} r = a

and

\sqrt{3} r = 4 a

(B)

r = 2 \sqrt{2} a

and

4 r = \sqrt{3} a

(C)

r = 2 \sqrt{2} a

and

\sqrt{3} r = 4 a

(D)

2 \sqrt{2} r = a

and

4 r = \sqrt{3} a

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Q2.

A compound is formed by two elements $X$ and $Y .$ The element $Y$ forms cubic close packed arrangement and those of element $X$ occupy one third of the tetrahedral voids. What is the formula of the compound?

(A)

X_{2} Y_{3}

(B)

X_{3} Y_{2}

(C)

X_{3} Y

(D)

{XY}_{3}

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