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Solid State · Question 43

AIPMT 2003MCQMedium📈 Topic in 25% papers+4−1
1

The pyknometric density of sodium chloride crystal is 2.165 103 kg m-3 while its X-ray density is 2.178 103 kg m-3. The fraction of unoccupied sites in sodium chloride crystal is

  1. 5.96
  2. 5.96 10-2
  3. 5.96 10-1
  4. 5.96 10-3

Answer

(4) 5.96 10-3

Solution

X-ray density corresponds to a perfect lattice; the lower measured (pyknometric) density is due to vacant sites (Schottky defects).

⇒ Fraction of unoccupied sites = X-ray - pyk X-ray

= 2.178 - 2.1652.178

= 0.0132.178

5.96 10-3

Answer: (4)

Out of syllabusAIPMT 2003

Keep practising — Solid State

2

Number of atoms per unit cell in B.C.C. is

  1. 9
  2. 4
  3. 2
  4. 1
AIPMT 2002
3

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

  1. 6
  2. 8
  3. 12
  4. 4
Out of syllabusAIPMT 2001
4

The cations and anions are arranged in alternate form in

  1. metallic crystal
  2. ionic crystal
  3. covalent crystal
  4. semi-conductor crystal
AIPMT 2000
5

Cations and anions combine in a crystal to form the following type of compound

  1. ionic
  2. metallic
  3. covalent
  4. dipole-dipole
Out of syllabusAIPMT 2000
6

In a cubic crystal, A-atoms are placed at every corner and B-atoms at the centre of every face. The formula of the compound is

  1. AB
  2. AB3
  3. A2B2
  4. A2B3
Out of syllabusAIPMT 2000

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