Question # 1

The no. of electrons in the valence shell of noble gases are

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2

4

8

2 or 8

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

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Carbon monoxide

Oxygen

Nitrogen

Argon

the homogeneous mixture of two or more substances is ____________.

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Solution

Stronger

Suspension

None

If the solute-solute forces are strong enough than those of solute- solvent force, The solute:

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dissolves readily

does not dissolve

dissolve slowly

dissolves and precipitates

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:

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H2S

Br2

S

2HBr

Graphite is ___________

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Hard

Nil

Soft

Nil

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

____________ agents gains electrons in chemical reaction.

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Reduction

Oxidation

Both

None of these

All chemists invented all except:

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Beakers

Spirit lamp

Funnels

Retorts

___________ is a pure substance that can be broken down.

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Matter

Element

Mass

Mixture

Along the period which one of the following decrease:

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Atomic radius

ionization energy

electron affinity

electronegative

The formula of benzene is _________

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C6H6O3

C6H6

C12H22

Nil

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