Question # 1

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

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Silica

Copper

Diamond

Graphite

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

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

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Fe

KBr

Diamond

Cr

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

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

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

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

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12

8

6

10

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

In diamond, which hybridization is there?

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sp2

dsp2

sp3

sp

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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

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

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

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

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 transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-units cells

only one unit cell

8-unit cells

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

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