Question # 1

The crystal of diamond is

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ionic

molecular

covalent

metallic

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

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 crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

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

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

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allotropy

isomorphism

polymorphism

isotropy

In crystal of sodium chloride, a Cl-1 ion present at the corner of cube is shared between how many cubes?

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8

4

6

10

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

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

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

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

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Fe

KBr

Diamond

Cr

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

Amorphous means

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arranged

ordered

shaped

shapeles (no arrangements)

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

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