Question # 1

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

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

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

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

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face centred cubic

body centred cubic

tetrahedral

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

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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

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

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

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

Polymorphism is shown by AgNO3. Which one of the following options is true for AgNO3?

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Orthorhombic and rhombohedral

Cubic and orthorhombic

Cubic and tetragonal

Monoclinic and hexagonal

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

The existence of an element in more than one form is called

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allotropy

isomorphism

polymorphism

isotropy

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

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

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