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Solid State · Question 8

NEET (UG) 2021MCQMedium📈 Topic in 12% papers+4−1
1

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

  1. 12, 6
  2. 8, 4
  3. 6, 12
  4. 2, 1

Answer

(1) 12, 6

Solution

Hexagonal (hcp) unit cell: 12 corner atoms, 2 face-centre atoms and 3 atoms inside.

Effective number of atoms N = 12 16 + 2 12 + 3 = 6

Number of tetrahedral voids = 2N and number of octahedral voids = N

Tetrahedral voids = 2 6 = 12, octahedral voids = 6

Answer: (1)

Out of syllabusNEET (UG) 2021

Keep practising — Solid State

2

An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :

  1. 24 288 pm
  2. 4 3 288 pm
  3. 4 2 288 pm
  4. 34 288 pm
Out of syllabusNEET (UG) 2020
3

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75\% of octahedral voids. The formula of the compound is :

  1. C3A4
  2. C4A3
  3. C2A3
  4. C3A
Out of syllabusNEET (UG) 2019
4

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

  1. 3 2
  2. 4 33 2
  3. 3 34 2
  4. 12
Out of syllabusNEET 2018
5

Which is the incorrect statement?

  1. Density decreases in case of crystals with Schottky defect.
  2. NaCl(s) is insulator, silicon is semi conductor, silver is conductor, quartz is piezoelectric crystal.
  3. Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
  4. FeO0.98 has non-stoichiometric metal deficiency defect.
Out of syllabusNEET 2017
6

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)

  1. 527 pm
  2. 264 pm
  3. 154 pm
  4. 352 pm
Out of syllabusNEET 2016 (Phase 1)
7

The ionic radii of A+ and B- ions are 0.98 10-10 m and 1.81 10-10 m. The coordination number of each ion in AB is

  1. 8
  2. 2
  3. 6
  4. 4
Out of syllabusNEET 2016 (Phase 1)
8

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
Out of syllabusNEET 2016 (Phase 2)
9

The vacant space in bcc lattice unit cell is

  1. 48%
  2. 23%
  3. 32%
  4. 26%
Out of syllabusAIPMT 2015
10

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
11

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)

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