# MCQ Questions for Class 12 Chemistry Chapter 1 The Solid State with Answers

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## The Solid State Class 12 MCQs Questions with Answers

Solve this The Solid State Multiple Choice Questions of Class 12 Chemistry Chapter 1 MCQ, so as not to miss out on any concept from being clear about what they mean!

Question 1.
Close packing is maximum in the crystal which is
(a) bcc
(b) fee
(c) simple cubic
(d) end centred cubic

Question 2.
In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is
(a) n-type
(b) p-type
(c) Frenkel defect
(d) Schottky defect

Question 3.
The coordination number of metal crystallizing in a hexagonal close packing structure are
(a) 12
(b) 4
(c) 8
(d) 10

Question 4.
In a body centred unit cell, the number of atoms present is
(a) 1
(b) 2
(c) 3
(d) 4

Question 5.
In a trigonal crystal
(a) a = b = c, α = ß = γ ≠ 90°
(b) a = b ≠ c, α = ß = γ = 90°
(c) a ≠ b ≠ c, α = ß = γ = 90°
(d) a = b ≠ c, α = ß = 90°, γ = 120°

Answer: (a) a = b = c, α = ß = γ ≠ 90°

Question 6.
The appearance of colour in solid alkali metal halides is generally due to
(a) Schottky defect
(b) Frenkel defect
(c) F-centre
(d) Interstitial position

Question 7.
In a body centred cubic structure, the space occupied is about
(a) 74%
(b) 20%
(c) 68%
(d) 52.4%

Question 8.
Some polar crystals when heated produce small electrical current. The phenomenon is called
(a) Ferroelectricity
(b) Anti-ferroelectricity
(c) Pyroelectricity
(d) Piezoelectricity.

Question 9.
The empty space within hep arrangement is
(a) 34%
(b) 47.6%
(c) 32%
(d) 26%

Question 10.
A crystal system with axes a ≠ b ≠ c and angles α ≠ ß ≠ γ ≠ 90° corresponds to
(a) monoclinic
(b) triclinic
(c) cubic
(d) tetragonal

Question 11.
The number of Cl ions present around each Na+ ion in NaCl crystal lattice is
(a) 3
(b) 4
(c) 8
(d) 6

Question 12.
To get n-type semiconductor from silicon, it should be doped with an element having valence electrons of
(a) 2
(b) 1
(c) 3
(d) 5

Question 13.
Volume occupied by atoms in fee is
(a) 74%
(b) 68%
(c) 52.4%
(d) 75%

Question 14.
Percentage empty space in a bcc arrangement is
(a) 74%
(b) 68%
(c) 32%
(d) 26%

Question 15.
To get p-type semiconductor, impurity to be added to silicon should have which of the following number of valence electrons?
(a) 2
(b) 3
(c) 1
(d) 5

Question 16.
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because
(a) all the domains get oriented in the direction of magnetic field.
(b) all the domains get oriented in the direction opposite to the magnetic field.
(c) domains get oriented randomly.
(d) domains are not affected by magnetic field.

Answer: (a) all the domains get oriented in the direction of magnetic field.

Question 17.
The presence of F-centres in a crystal make it
(a) conducting
(b) non-conducting
(c) coloured
(d) colourless

Question 18.
The number of tetrahedral voids in the unit cell of a fee lattice of similar atoms is
(a) 4
(b) 6
(c) 8
(d) 10

Question 19.
Fe, Co and Ni are
(a) ferri magnetic materials
(b) anti-ferromagnetic materials
(c) ferromagnetic materials
(d) diamagnetic materials

Question 20.
Due to Frenkel defect, the density of the ionic solids
(a) increases
(b) decreases
(c) does not change
(d) depends on pressure

Question 21.
Which of the following is an amorphous solid?
(a) graphite
(b) glass
(c) chrome alum
(d) silicon carbide

Question 22.
In a face-centred cubic unit cell, the edge length is
(a) $$\frac { 4 }{√3}$$ r
(b) $$\frac { 4 }{√2}$$ r
(c) 2 r
(d) $$\frac { √3 }{2}$$ r

Answer: (b) $$\frac { 4 }{√2}$$ r

Question 23.
Amorphous solid is
(a) rubber
(b) plastic
(c) glass
(d) all

Assertion and Reason Type Questions

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.

Question 24.
Assertion: In any ionic solid (MX) with Schottky defects, the number of positive and negative ions are same.
Reason: Equal number of cation and anion vacancies are present.

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

Question 25.
Assertion: ZnS has a tetrahedral arrangement.
Reason: In ZnS, S2- ions occupy the tetrahedral sites while Zn2+ ions form cubic close packed structure.

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.

Question 26.
Assertion: In CsCl structure, the co-ordination number of Cs+ ion is 8.
Reason: Cl ions in CsCl have body centred cubic arrangement.

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.

Question 27.
Assertion: In ZnO, the excess Zn2+ ions are present in interstitial sites.
Reason: Metal excess crystals have either missing cation or anion in interstitial site.

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.

Question 28.
Assertion: FeO is non-stoichiometric with Feo.95O.
Reason: Some Fe2+ ions are replaced by Fe3+ as 3Fe2+ = 2Fe3+ to maintain electrical neutrality.

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

Question 29.
Assertion: In CaF2, P ions occupy all the tetrahedral sites.
Reason: The number of Ca2+ is double the number of F ions.

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.

Question 30.
Assertion: Size of cation is larger in tetrahedral void than in octahedral void.
Reason: The cations occupy less space than anions in crystal close packing.

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.

Question 31.
Assertion: Frenkel defect is shown by silver halides.
Reason: Silver ions are small in size and can easily fit in interstitial sites.

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

Question 32.
Assertion: In Frenkel defect, density of the crystalline solid does not change.
Reason: In Frenkel defect, no cation or anion leaves the crystal.

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

Question 33.
Assertion: Frenkel and Schottky defects are stoichiometric defects.
Reason: Both defects change the density of the crystalline solid.