Question # 1

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

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

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triclinic

rhombohedral

cubic

hexagonal

The arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

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

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

One of the following is a ionic solid. Which is that?

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Fe

KBr

Diamond

Cr

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems

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

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

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