Question # 1

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

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

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Oxygen

Aluminum

Silicon

Iron

_____________ revolves in orbits around nucleus.

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Electron

Proton

Neutrons

Nil

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

_________ can be separated by physical means.

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Mixture

Compound

Solution

Nil

It is heterogeneous mixture

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Sand

Milk

Air

Brass

The symbol of sodium is :

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Sa

Na

Pa

Ca

The number of proton in an atom is called _________ number.

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Molecule

Formula

Atomic

Molar

An ion is a charged particles:

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True

False

In some conditions

Never

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

Salt & water is a _________ mixture.

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Homogeneous

Heterogeneous

It is not mixture

Nil

____________ Metals are electronegative in nature.

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Pure-

Noble-

Non-

Nil

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

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0.15

0.18

0.21

0.24

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

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