MCQs of Solid State

Solid State MCQs

Showing 21 to 30 out of 151 Questions

21.

Which of the following compound has highest melting point ?

(a)	SiO_2(s)
(b)	H₂O_(s)
(c)	Mg_(s)
(d)	CO_2(s)

22.

What is the percentage of empty space in ccp and bcc structures ?

(a)	48% and 26%
(b)	30% and 26%
(c)	26% and 32 %
(d)	32 % and 48%

23.

The correct statement about the crystal structure of zinc blende is _____

(a)	Zn²⁺ and S^2- each has co-ordination number equal to six
(b)	Zn²⁺ and S^2- each has co-ordination number equal to four
(c)	Zn²⁺ and S^2- each has co-ordination number equal to two
(d)	Zn²⁺ and S^2- each has co-ordination number equal to eight

24.

In crystal structure of MgO, ionic radius of each of Mg²⁺ and O^2- is respectively 0.0659 and 0.139 nm. What will be the position of Mg²⁺ ions ?

(a)	In the octahedral void of cubic close packing arrangement.
(b)	In each of tetrahedral voids.
(c)	Some in octahedral voids and some in tetrahedral voids.
(d)	In alternative tetrahedral voids.

25.

For hexagonal crystal syestem which of the following sets of parameters of axial distances and axial angles is correct ?

(a)	a = b = c, α = β = γ = 90°
(b)	a = b ≠ c, α = β = γ = 90°
(c)	a = b = c, α = β = γ ≠ 90°
(d)	a = b ≠ c, α = β = 90°, γ = 120°

26.

Crystal system having axial distance a ≠ b ≠ c and axial angle α ≠ β ≠ γ ≠ 90° is _____ .

(a)	Tetragonal
(b)	Triclinic
(c)	Monoclinic
(d)	Orthorhombic

27.

Which of the following is not an example of tetragonal crystal system ?

(a)	TiO₂
(b)	CuSO₄
(c)	SnO₂
(d)	BaSO₄

28.

In a unit cell, the relation between the edge of the cube (a) and the radius of the particle (r) in fcc, bcc and simple cubic lattice is respectively _____ .

(a)	$2 r, \frac{4 r}{\sqrt{3}}, 2 \sqrt{2} r$
(b)	$2 \sqrt{2} r, \frac{4 r}{\sqrt{3}}, 2 r$
(c)	$2 \sqrt{2} r, 2 r, \frac{4 r}{\sqrt{3}}$
(d)	$\frac{4 r}{\sqrt{3}}, 2 \sqrt{2} r, 2 r$

29.

In the crystal of a compound formed by elements A and B, atoms of A are at the corners of the cube and atoms of B are at the centres of the faces. What should be the formula of this compound ?

(a)	AB
(b)	AB₂
(c)	AB₃
(d)	A₃B

30.

Select from the following the correct set of fractions of constituents (atoms, ions and molecules) associated respectively with corners, edges and faces to form crystal lattice points in a crystal.

(a)	$\frac{1}{8}, \frac{1}{4}, \frac{1}{2}$
(b)	$\frac{1}{4}, \frac{1}{8}, \frac{1}{2}$
(c)	$\frac{1}{2}, \frac{1}{4}, \frac{1}{8}$
(d)	$\frac{1}{8}, \frac{1}{2}, \frac{1}{4}$

Showing 21 to 30 out of 151 Questions