Question # 1

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 transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

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

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

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 geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

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

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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