29th Oct Solid State Quiz 4 – Punjab Meritorious School Preparation Portal

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Lithium has a bcc structure. Its density is 530 kg m^–3 and its atomic mass is 6.94 g mol^–1. Calculate the edge length of a unit cell of lithium metal. (NA = 6.02 × 1023 mol^–1)

527 pm

264 pm

154 pm

352 pm

Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?

157

181

108

128

The pyknometric density of sodium chloride crystal is 2.165 × 10³ kgm^–3 while its X-ray density is 2.178 × 10³ kgm^–3. The fraction of unoccupied sites in sodium chloride crystal is

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm^–3.

The molar mass of the metal is (NA Avogadro’s constant = 6.02 × 1023 mol^–1)

Which of the following statements is not correct?

The number of carbon atoms in a unit cell of diamond is 8

The number of Bravais lattices in which a crystal can be categorized is 14.

The fraction of the total volume occupied by the atoms in a primitive cell is 0.48.

Molecular solids are generally volatile.

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 systems will be respectively

The fraction of total volume occupied by the atoms present in a simple cube is

$The fraction of total volume occupied by the atoms present in a simple cube is$

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is

The edge length of face-centred unit cubic cells is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

144 pm

398 pm

288 pm

618 pm

CsBr crystallises in a body-centred cubic lattice.

The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02 × 10²³ mol^–1, the density of CsBr is

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