Question # 1

The metallic plates through which electrons enters and leaves electrolytes:

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Wires

Electrodes

Both

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

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

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Carbon monoxide

Oxygen

Nitrogen

Argon

The molecular mass of water is

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16 amu

14 amu

18 amu

20 amu

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

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

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2

4

8

2 or 8

The mass of one molecule of water is:

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18 amu

18g

18mg

18kg

The modern periodic table is based on:

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Atomic number

Mass number

Relative mass

Nil

N consist of ________________ sub shells.

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4

1

2

0

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

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Oxygen

Aluminum

Silicon

Iron

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

An ________________ scientist arranged the elements in order in periodic table.

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English

Italian

African

Indian

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

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