Chemistry XII - Solid State 01

Question : 1

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Three states of matter differ on the basis of intermolecular forces. The fluids include

Options:

	Solid only
	Liquid only
	Gases only
	Both liquid and gases

Solution :

Fluids have tendency to flow.

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Question : 2

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The incorrect statement among the following is

Options:

	Amorphous solids, sometimes are called as super-cooled liquids
	Amorphous solids are isotropic as no long range order in them and arrangement is irregular along all the directions
	Quartz and Quartz glass are crystalline solids
	Crystalline solids have definite and characteristic melting point and heat of fusion

Solution :

Quartz glass is amorphous

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Question : 3

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The attractive forces present among solid SO₂is

Options:

	Dispersion forces
	Dipole-dipole interactions
	Dipole-induced dipole interaction
	Ion-dipole interaction

Solution :

Dipole-dipole interaction

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Question : 4

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Which is mismatched regarding the examples given for the types of solid mentioned ?

Options:

	Metallic solids           Rubidium, Brass
	Ionic solids           AlN, SiC
	Covalent solids          C (Graphite), SiO2 (quartz)
	Molecular solids          Ice, Solid NH3

Solution :

AlN, SiC are covalent solids

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Question : 5

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Centred unit cells include

Options:

	Face centred unit cell
	Primitive unit cell
	Body centred unit cell
	Both (1) & (3)

Solution :

In centred unit cells, atoms are present at positions other than corners.

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Question : 6

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Total number of lattice point present in face centred cubic unit cell is

Options:

	3
	4
	9
	14

Solution :

8 corners + 6 face centre = 14

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Question : 7

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If atom A is present at alternate corners, B at alternate face centre and C at 50% edge centre then the formula of unit cell will be

Options:

Solution :

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Question : 8

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In end centred unit cells the constituent particles or atoms are located at

Options:

	Any two opposite face centres only
	Any two opposite face centres + body centre
	Any two opposite face centres + corners
	50% corners + body centre

Solution :

In end centred unit cells, particles are present at any two opposite face centre and corners

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Question : 9

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Portion of an atom that actually belongs to a particular unit cell, if atom is present at corner

Options:

	1⁄8
	1
	2
	8

Solution :

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Question : 10

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A solid is hard but brittle, have high melting point and is insulator in solid state but conductor in molten state. The solid is

Options:

	Molecular solid
	Metallic solid
	Ionic solid
	Network solid

Solution :

Ionic solids.