Question # 1

The number of isotopes of carbon are

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1

2

3

5

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

CO2 the oxidation number of C =.

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+1

+2

+3

+4

T (K) =

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(T) °C + 273

(T) °C -273

(T) °C + 373

(T) °C -373

............... periodic table consist of group & periods.

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Bohr

Rutherford

Mendeleev's

Nil

Which one of the following is heterogeneous mixture?

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milk

ink

milk of magnesia

sugar solution

The solubility of which salt increases in heating?

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Li₂SO₄

Ce₂(SO₄)₃

NaCI

KCI

The core of the earth is mostly made from ____________

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Nickel

Iron

A % B

Copper

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

It is an ionic compound

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H2O

NaCI

CH4

HF

105 elements were discovered by the year ________________

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1984

1974

1086

1996

The escape of gaseous molecules one by one is called ____________.

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Diffusion

Effusion

A & b

Nil

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