MCQs of Solid State

Solid State MCQs

Showing 141 to 150 out of 151 Questions

141.

A compound formed by element X and Y crystallizes in the cubic structure where X atoms are at the corner of the cube and Y atoms are present only at one set of opposite faces. What is the formula of the compound ?

(a)	X₂Y₃
(b)	X₃Y₂
(c)	XY
(d)	XY₃

142.

In a compound atoms of element Y form ccp lattice and those of element X occupy

\frac{2}{3} rd

of tetrahedral voids. The formula of the compound will be

(a)	X₄Y₃
(b)	X₂Y₃
(c)	X₂Y
(d)	X₃Y₄

143.

A crystalline solid is made up of A, B and C elements. Atoms of A form fcc packing; atoms of B occupy octahedral voids while atoms C occupy tetrahedral voids. What will be simplest formula of solid if atom along one body diagonal are removed ?

(a)	A₂ B₄ C₄
(b)	A₅ B₄ C₈
(c)	A₆ B₃ C₄
(d)	A₃ B₃ C₆

144.

If 'a' stands for the edge length of the cubic systems : simple cubic, body-centred cubic and face-centred cubic, then the ratio of radii of the spheres in these system will be respectively.

(a)	$\frac{1}{2} a : \frac{\sqrt{3}}{2} a : \frac{\sqrt{2}}{2} a$
(b)	$1 a : \sqrt{3} a : \sqrt{2} a$
(c)	$\frac{1}{2} a : \frac{\sqrt{3}}{4} a : \frac{1}{2 \sqrt{2}} a$
(d)	$\frac{1}{2} a : \sqrt{3} a : \frac{1}{\sqrt{2}} a$

145.

How many unit cells are present in a cube shaped crystal of NaCl of mass 1.00 g ? [Atomic masses of Na = 23, Cl = 35.5]

(a)	2.57 × 10²¹
(b)	5.14 × 10²¹
(c)	1.28 × 10²¹
(d)	1.71 × 10²¹

146.

An element occur in bcc structure with a cell edge as 288 pm. The density of metal is 7.2 gm cm^-3. How many atom does 208 g of the element contain ?

(a)	14.4 × 10²⁰
(b)	24.16 × 10²³
(c)	12.08 × 10²³
(d)	28.8 × 10²⁰

147.

Percentages of free space in cubic close packed structure and in body centred packed structure are respectively.

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

148.

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

(a)	A₂B
(b)	AB₂
(c)	A₂B₃
(d)	A₂B₅

149.

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be

(a)	300 pm
(b)	240 pm
(c)	152 pm
(d)	75 pm

150.

If NaCl is doped with 10^-4 mol% of SrCl₂ , the concentration of cation vacancies will be(N_A = 6.02 × 10²³ mol^-1)

(a)	6.02 × 10¹⁶ mol^-1
(b)	6.02 × 10¹⁷ mol^-1
(c)	6.02 × 10¹⁴ mol^-1
(d)	6.02 × 10¹⁵ mol^-1

Showing 141 to 150 out of 151 Questions