Question # 1

lonic solids don't conduct the electrical current because

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ion do not have translatory motion

free electrons are less

the coordination number of the ion is very high

strong covalent bonds are present in their structure

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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

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Fe

KBr

Diamond

Cr

The electrical conductivity of the metals decreases with the increasing temperature. This is because

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the number of free electrons decrease

the bonds of the metal atoms become weak

the to and fro motion of the metal ions decrease

the increase of to and fro motion of the metal ions hinders the free movement of electrons

In diamond, which hybridization is there?

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sp2

dsp2

sp3

sp

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

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

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

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

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8

12

6

10

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

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

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

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

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

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face centred cubic

body centred cubic

tetrahedral

hexagonal

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