Question # 1

H2O is what type of molecules it is:

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Manoatomic

Polyatomic

Pentaatomic

Nil

The No. of atoms in 1 mole of carbiton is

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6.02 x 1021

6.02 x 1022

6.02 x 1023

6.02 x 1024

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

The third abundant as found in the earth' crust is:

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Carbon monoxide

Oxygen

Nitrogen

Argon

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

_________ can be separated by physical means.

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Mixture

Compound

Solution

Nil

Which one of the following element is found in most abundance in the earth's crust?

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Oxygen

Aluminum

Silicon

Iron

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

___________ is a pure substance that can be broken down.

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Matter

Element

Mass

Mixture

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

There are _________ elements found till now .

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120

118

119

117

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