Question # 1

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

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Carbon monoxide

Oxygen

Nitrogen

Argon

Electrons carry _________ charge.

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+

_

Neutral

Bouble Positive

................. can be decomposed into simpler substanmce.

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Compound

Element

Solution

Mixture

The modern periodic table is based on:

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Atomic number

Mass number

Relative mass

Nil

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

________________ orbital is more complex in shape.

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s

p

f

d

There are ____________ states of matter

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4

3

2

1

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

The right most position in the periodic table is occupied by:

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Alkall metals

Alkaline earth metals

Translation metals

Noble gasses

In the redox reaction between zn and HCI. the oxidizing agent is:

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zn

H⁺

C

H²

The number of isotopes of carbon are

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1

2

3

5

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

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Molecule

Formula

Atomic

Molar

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