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CBSE

Subject

Chemistry

NEET Chemistry : The Solid State

Multiple Choice Questions

71.

Crystalline solids have

short range order
long range order
anisotropic distribution
All of these.

72.

Assertion : Graphite is an example of tetragonal crystal system.

Reason : For a tetragonal system, a = b $\neq$ c, $α$ = $β$ = 90°, $γ$ = 120°

If both assertion and reason are true but reason is not the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.

73.

An AB₂ type structure is found in :

NaCl
CaF₂
Al₂O₃
N₂O

74.

Schottky defect defines imperfection in the lattice structure of a :

solid
gas
liquid
plasma

75.

The crystal system of a compound with unit cell dimensions a= 0.387 nm, b= 0.387 nm and c = 0.504 nm and $α - β -$ 90° and $γ -$ 120° is

Cubic
Hexagonal
Orthorhombic
Rhombohedral

76.

A solid AB has NaCl type structure. The radius of A⁺is 100 pm. What is the radius of B^-?

190.47
540.13
525
78.12

77.

What is the co-ordination number of Cl^- in NaCl crystal ?

78.

An element (atomic mass 100 g/mol) having BCC structure has unit cell edge 400 pm. The density of element is (No. of atom in BCC (Z) = 2).

2.144 g/cm³
7.289 g/cm³
5.188 g/cm³
10.376 g/cm³

79.

If Z is the number of atoms in the unit cell that represents the closest packing sequence... A B C A B C..., the number of tetrahedral voids in the unit cell is equal to

80.

Suppose the mass of a single Ag-atom is m. Ag metal crystallises in fcc lattice with unit cell of length a. The density of Ag metal in terms of a and 'm' is

$\frac{4 m}{a^{3}}$
$\frac{2 m}{a^{3}}$
$\frac{m}{a^{3}}$
$\frac{m}{4 a^{3}}$

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