Solid State Chemistry

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming

(a) allotropic crystals

(b) liquid crystals

(c) isomeric crystals

(d) isomorphous crystals.

The ability of a substance to assume two or more crystalline structures is called

(a) isomerism

(b) polymorphism

(c) isomorphism

(d) amorphism.

Glass is a

(a) liquid

(b) solid

(c) supercooled liquid

(d) transparent organic polymer.

Cation and anion combines in a crystal to form following type of compound

(a) ionic

(b) metallic

(c) covalent

(d) dipole-dipole.

Cation and anion combines in a crystal to form following type of compound

(a) ionic

(b) metallic

(c) covalent

(d) dipole-dipole.

Cation and anion combines in a crystal to form following type of compound

(a) ionic

(b) metallic

(c) covalent

(d) dipole-dipole.

Cation and anion combines in a crystal to form following type of compound

(a) ionic

(b) metallic

(c) covalent

(d) dipole-dipole.

Most crystals show good cleavage because their atoms, ions or molecules are

(a) weakly bonded together

(b) strongly bonded together

(c) spherically symmetrical

(d) arranged in planes.

For two ionic solids CaO and KI, identify the wrong statement among the following.

(a) CaO has high melting point.

(b) Lattice energy of CaO is much larger than that of KI.

(c) KI has high melting point.

(d) KI is soluble in benzene.

For orthorhombic system axial ratios are a ≠ b ≠ c and the axial angles are

(a) a = b = g ≠ 90º

(b) a = b = g = 90º

(c) a = g = 90º, b ≠ 90º

(d) a ≠ b ≠ g ≠ 90º

The fcc crystal contains how many atoms in each unit cell?

(a) 1

(b) 2

(c) 4

(d) 6

In a face-centred cubic lattice, a unit cell is shared equally by how many unit cells?

(a) 2

(b) 4

(c) 6

(d) 8

When Zn converts from melted state to its solid state, it has hcp structure, then find the number of nearest atoms.

(a) 6

(b) 8

(c) 12

(d) 4

The second order Bragg diffraction of X-rays with λ = 1.00 Å from a set of parallel planes in a metal occurs at an angle 60°. The distance between the scattering planes in the crystal is

(a) 2.00 Å

(b) 1.00 Å

(c) 0.575 Å

(d) 1.15 Å

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y–) will be

(a) 275.1 pm

(b) 322.5 pm

(c) 241.5 pm

(d) 165.7 pm

The ionic radii of A+ and B– ions are 0.98 × 10–10 m and 1.81 × 10–10 m. The coordination number of each ion in AB is

(a) 8

(b) 2

(c) 6

(d) 4

The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is

(a) face-centred cube

(b) simple cube

(c) body-centred cube

(d) none of these.