Question # 1

What is the co-ordination number of face centered cubic structure?

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12

8

6

10

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

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

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

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

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6

4

2

8

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

The crystal of diamond is

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ionic

molecular

covalent

metallic

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

Metallic bonds have been explained by many theories. Luis Pauling has proposed a theory called

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molecular orbital theory

electron gas theory

band theory

valence bond theory

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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