Question # 1

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

_________ which occupies space and have mass.

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Matter

Atom

Molecule

All of above

The molecular mass of water is

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16 amu

14 amu

18 amu

20 amu

The valency of nitrogen is

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1

2

3

4

_____________ revolves in orbits around nucleus.

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Electron

Proton

Neutrons

Nil

_________ shells of noble gases is complete.

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Outer most

2

1

Nil

Potassium's atomic no. is :

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17

18

19

20

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

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

An ion is a charged particles:

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True

False

In some conditions

Never

Electron _____________ energy when thy jump from higher to lower level.

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Absorb

Radiate

Nothing

Nil

Mixture has _________ types.

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3

2

1

No types

The symbol of lead us

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As

Pb

Sb

Na

The fundamental unit of elements is ___________

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Molecule

Atom

Matter

Mixture

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

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