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Solid State · Question 38

AIPMT 2006MCQEasy📈 Topic in 25% papers+4−1
1

The appearance of colour in solid alkali metal halides is generally due to

  1. interstitial positions
  2. F-centres
  3. Schottky defect
  4. Frenkel defect

Answer

(2) F-centres

Solution

As per NCERT, when alkali metal halides are heated in the vapour of the alkali metal, anionic sites are left vacant and are occupied by unpaired electrons (metal excess defect).

⇒ These anionic sites occupied by unpaired electrons are called F-centres.

⇒ They absorb visible light and impart colour, e.g. excess Na makes NaCl yellow, excess Li makes LiCl pink and excess K makes KCl violet.

Answer: (2)

Out of syllabusAIPMT 2006

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2

CsBr crystallises in a body centered 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

  1. 4.25 g/cm3
  2. 42.5 g/cm3
  3. 0.425 g/cm3
  4. 8.25 g/cm3
Out of syllabusAIPMT 2006
3

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 A. The value of lattice constant for this lattice is

  1. 2.54 A
  2. 3.59 A
  3. 1.27 A
  4. 5.08 A
AIPMT 2005
4

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

  1. 2
  2. 4
  3. 6
  4. 8
Out of syllabusAIPMT 2005
5

A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centers. The formula of the compound is :-

  1. XY3
  2. X3Y
  3. XY
  4. XY2
Out of syllabusAIPMT 2004
6

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
Out of syllabusAIPMT 2003
7

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

  1. 9
  2. 4
  3. 2
  4. 1
AIPMT 2002
8

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
9

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
10

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
11

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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