Chemistry XII - Solid State 03

Question : 1

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Most unsymmetrical and most symmetrical crystal system present, is respectively

Options:

	Monoclinic, Tetragonal
	Monoclinic, Cubic
	Triclinic, Cubic
	Triclinic, Tetragonal

Solution :

Fact

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Question : 2

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In which type of crystal system, all lattices i.e. simple, face centred, body centred and end centred are present?

Options:

	Cubic
	Tetragonal
	Orthorhombic
	Monoclinic

Solution :

Orthorhombic has simple, face centred, body centred and end centred arrangement

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Question : 3

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For the rhombohedral system, which is correctly followed regarding axial distance and axial angles?

Options:

	a = b ≠ c, α = β = γ = 90°
	a ≠ b ≠ c, α = β = γ = 90°
	a = b ≠ c, α = β = 90° γ = 120°
	a = b = c, α = β = γ ≠ 90°

Solution :

Fact

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Question : 4

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Coordination number of the atom or sphere present in two dimensional hexagonal close packing is

Options:

	4
	6
	8
	12

Solution :

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Question : 5

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The arrangement that will be followed for three dimensional square close packing is

Options:

	AAAAAA…………
	ABABAB……………
	ABCABC…………
	Both (2) & (3)

Solution :

As same arrangement followed for all layers hence AAAA …..

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Question : 6

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Which is mismatched regarding the examples given for the crystal system given?

Options:

	bcc = Li, Na, K
	hcp = Be, Mg, Zn
	ccp = Cd, Mo, All noble gases (He, Ne, Ar)
	All of these

Solution :

Cd, Mo → hcp, All noble gases has ccp structure except He (hcp)

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Question : 7

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The 3 dimensional arrangement in which spheres in square packing of first layer do not touch and spheres of second layer occupies all the voids of first layer and sphere of third layers is occupying voids of second layer and so on is

Options:

	Square close packing
	Hexagonal close packing
	Cubic close Packing
	Body centred cubic arrangement

Solution :

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Question : 8

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Packing efficiency of three dimensional body centred cubic arrangement is

Options:

	52.4%
	68%
	74%
	Can’t predicted

Solution :

bcc occupies 68% of total space

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Question : 9

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The number of nearest neighbour of a particle in one dimensional close packing arrangement and two dimensional square close packing is respectively

Options:

	4, 4
	4, 6
	2, 4
	2, 6

Solution :

Fact

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Question : 10

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Total possible primitive unit cells and three dimensional lattices i.e. Bravais lattice present is respectively

Options:

	5, 7
	7, 7
	7, 14
	14, 14

Solution :

7 crystal system and 14 Bravais lattice possible