Question # 1

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

The fundamental unit of elements is ___________

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Molecule

Atom

Matter

Mixture

The symbol of sodium is :

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Sa

Na

Pa

Ca

Amadeo Avogadro was a _______________ scientist.

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Italian

English

Greek

Russian

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

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Mixture

Elements

Solution

Compound

Salt & water is a _________ mixture.

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Homogeneous

Heterogeneous

It is not mixture

Nil

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

The mass of one molecule of water is:

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18 amu

18g

18mg

18kg

The symbol of lead us

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As

Pb

Sb

Na

How many numbers of moles are equivalent to 8 grams of CO₂?

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0.15

0.18

0.21

0.24

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

One mole of sodium = ______ .

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24 g

25 g

26 g

23 g

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Chemistry 9th Class English Medium Unit 1 Online Test MCQs With Answers

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