Question # 1

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

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

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

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

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

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

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

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6

4

2

8

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

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

In diamond, which hybridization is there?

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sp2

dsp2

sp3

sp

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

The crystal of diamond is

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ionic

molecular

covalent

metallic

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

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

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face centred cubic

body centred cubic

tetrahedral

hexagonal

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

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Fe

KBr

Diamond

Cr

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

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

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