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Solid State · Question 15

NEET 2016 (Phase 2)MCQMedium📈 Topic in 12% papers+4−1
1

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion ( Ca2+) and fluoride ion (F-) are

  1. 4 and 2
  2. 6 and 6
  3. 8 and 4
  4. 4 and 8

Answer

(3) 8 and 4

Solution

In the fluorite (CaF2) structure, Ca2+ ions form a ccp (fcc) lattice and F- ions occupy all the tetrahedral voids.

Each F- (in a tetrahedral void) is surrounded by 4 Ca2+ ions, so the coordination number of F- = 4.

The formula is CaF2 (cation : anion = 1 : 2), CN of Ca2+ = 2 × CN of F-

Coordination number of Ca2+ = 2 4 = 8

The coordination numbers are 8 and 4.

Answer: (3)

Out of syllabusNEET 2016 (Phase 2)

Keep practising — Solid State

2

The vacant space in bcc lattice unit cell is

  1. 48%
  2. 23%
  3. 32%
  4. 26%
Out of syllabusAIPMT 2015
3

The correct statement regarding defects in crystalline solids is

  1. Frenkel defects decrease the density of crystalline solids
  2. Frenkel defect is a dislocation defect
  3. Frenkel defect is found in halides of alkali metals
  4. Schottky defects have no effect on the density of crystalline solids
Out of syllabusAIPMT 2015
4

A given metal crystallises out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

  1. 80 pm
  2. 108 pm
  3. 40 pm
  4. 127 pm
Out of syllabusAIPMT 2015 (Cancelled)
5

If a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be

  1. 2 3a
  2. 4 3a
  3. 34a
  4. 32a
Out of syllabusAIPMT 2014
6

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)

  1. 27 g mol-1
  2. 20 g mol-1
  3. 40 g mol-1
  4. 30 g mol-1
Out of syllabusNEET 2013
7

The number of carbon atoms per unit cell of diamond unit cell is

  1. 6
  2. 1
  3. 4
  4. 8
Out of syllabusNEET 2013
8

Structure of a mixed oxide is cubic close packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

  1. ABO2
  2. A2BO2
  3. A2B3O4
  4. AB2O2
Out of syllabusAIPMT 2012 (Mains)
9

A metal crystallises with a face-centred cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

  1. 288 pm
  2. 408 pm
  3. 144 pm
  4. 204 pm
Out of syllabusAIPMT 2012 (Prelims)
10

The number of octahedral void(s) per atom present in a cubic close-packed structure is

  1. 1
  2. 3
  3. 2
  4. 4
Out of syllabusAIPMT 2012 (Prelims)
11

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

  1. 275.1 pm
  2. 322.5 pm
  3. 241.5 pm
  4. 165.7 pm
Out of syllabusAIPMT 2011 (Mains)

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