Question # 1

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

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1/8 th

1/4 th

1/2 th

1

How temperature affects the electrical conductivity of metals?

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Does not change at all

Decreases with increasing temperature

Increases with increasing temperature

Decreases with decreasing temperature

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

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

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

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