Question # 1

Some of crystals are good conductors of heat and electricity, they may be

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ionic in nature

of metallic character

covalent in nature

of molecular nature

Polymorphism is shown by AgNO3. Which one of the following options is true for AgNO3?

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Orthorhombic and rhombohedral

Cubic and orthorhombic

Cubic and tetragonal

Monoclinic and hexagonal

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

A crystal system in which all three angles and all three edges are different is called

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triclinic

rhombohedral

cubic

hexagonal

Amorphous means

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arranged

ordered

shaped

shapeles (no arrangements)

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

The number of Cl- ions per unit cell of NaCl are

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6

4

2

8

lonic solids are characterized by which one of the following properties

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moderately low pressure

high vapour pressure

good conductivity in solid state

solubility in polar solvents

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

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