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MCQ 1011 Mark

Which halide of magnesium has highest ionic character?

A
Chloride
B
Bromide
C
Iodide
✓
Fluoride

Answer

Correct option: D.

Fluoride

(d) : Smaller the anion and higher its electronegativity, greater is the ionic character:

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MCQ 1021 Mark

In face centered cubic unit cell, what is the volume occupied?

A
$\frac{4}{3} \pi r^3$
B
$\frac{8}{3} \pi r^3$
✓
$\frac{16}{3} \pi r^3$
D
$\frac{64 r^3}{3 \sqrt{3}}$

Answer

Correct option: C.

$\frac{16}{3} \pi r^3$

(c) : In face centered cubic unit cell, there are four atoms and their volume is given by
$
y=4 \times\left[\frac{4 \pi v^3}{3}\right]=\frac{16 \pi v^3}{3}
$

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MCQ 1031 Mark

Which metal crystallises in a simple cubic structure?

✓
Polonium
B
Copper
C
Nickel
D
Iron

Answer

Correct option: A.

Polonium

(a) : Polonium crystallises in a simple cubic structure. Copper and nickel crystallise in facecentered cubic structure. Iron crystallises in a body-centered cubic structure.

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MCQ 1041 Mark

Which metal among the following has the highest packing efficiency?