Question # 1

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

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

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 structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

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

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12

8

6

10

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

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

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

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

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 nature of crystal of diamond is

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metallic

molecular

covalent

ionic

The number of Na+, ions which surround each Cl- ion in the NaCl crystal lattice is

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8

12

6

10

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

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

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6

4

2

8

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

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

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triclinic

rhombohedral

cubic

hexagonal

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

In diamond, which hybridization is there?

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sp2

dsp2

sp3

sp

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