Question # 1

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

The quantity of a matter in a body is called ____________

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Mass

Weight

Atom

Molecule

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

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0.15

0.18

0.21

0.24

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

Atoms as a whole is _________

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+

_

No

Neutral

Sort out a compound from the following

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Air

Salt

Ice-cream

Iron

Polyatomic molecules consist of _________ atoms.

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1

More than 1

Less than 1

2

Potassium's atomic no. is :

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17

18

19

20

Atoms are made of sub _________

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Atoms

Molecules

Charge

Atomic particles

105 elements were discovered by the year ________________

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1984

1974

1086

1996

_____________ revolves in orbits around nucleus.

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Electron

Proton

Neutrons

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

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

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