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Solid State · Question 4

NEET (UG) 2022MCQMedium📈 Topic in 12% papers+4−1
1

Copper crystallises in fcc unit cell with cell edge length of 3.608 10-8 cm. The density of copper is 8.92 g cm-3. Calculate the atomic mass of copper.

  1. 63.1 u
  2. 31.55 u
  3. 60 u
  4. 65 u

Answer

(1) 63.1 u

Solution

For an fcc unit cell, z = 4.

d = z Ma3 NA

M = d a3 NAz

= 8.92 (3.608 10-8)3 6.022 10234

= 8.92 4.697 10-23 6.022 10234

= 63.1 g mol-1

Atomic mass of copper = 63.1 u

Answer: (1)

Out of syllabusNEET (UG) 2022

Keep practising — Solid State

2

Match List-I with List-II : Choose the correct answer from the options given below :

  1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
  2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
  4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
Out of syllabusNEET (UG) 2022 (Phase 2)
3

What fraction of Fe exists as Fe(III) in Fe0.96O ? (Consider Fe0.96O to be made up of Fe(II) and Fe(III) only)

  1. 120
  2. 112
  3. 0.08
  4. 116
Out of syllabusNEET (UG) 2022 (Phase 2)
4

The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

  1. 3
  2. 7
  3. 5
  4. 2
Out of syllabusNEET (UG) 2021
5

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
Out of syllabusNEET (UG) 2021
6

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
7

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
8

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
9

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
10

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)
11

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)

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