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Solid State · Question 37

AIPMT 2007MCQMedium📈 Topic in 25% papers+4−1
1

If NaCl is doped with 10-4 mol% of SrCl2, the concentration of cation vacancies will be (NA = 6.02 1023 mol-1)

  1. 6.02 1016 mol-1
  2. 6.02 1017 mol-1
  3. 6.02 1014 mol-1
  4. 6.02 1015 mol-1

Answer

(2) 6.02 1017 mol-1

Solution

As per NCERT, when NaCl is doped with SrCl2, each Sr2+ ion replaces two Na+ ions: it occupies the site of one and the other site remains vacant.

⇒ Number of cation vacancies = number of Sr2+ ions

10-4 mol% means 10-4 mol of SrCl2 in 100 mol of NaCl

⇒ SrCl2 per mole of NaCl = 10-4100 = 10-6 mol

∴ Cation vacancies = 10-6 6.02 1023

= 6.02 1017 mol-1

Answer: (2)

Out of syllabusAIPMT 2007

Keep practising — Solid State

2

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
Out of syllabusAIPMT 2006
3

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
4

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
5

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
6

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
7

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
8

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

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

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
10

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
11

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

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