Question # 1

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

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6

4

2

8

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

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

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, which hybridization is there?

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sp2

dsp2

sp3

sp

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

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

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

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Fe

KBr

Diamond

Cr

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

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

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

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

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 crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

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

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