Question # 1

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

Which is kept constant in the Charle's law:

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Pressure

Temperature

Volume

Mass

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

The no.of elements in the first period is

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2

8

18

23

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

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

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Alkall metals

Alkaline earth metals

Translation metals

Noble gasses

Water is a ____________ covalent compound .

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Polar

Non polar

Ionic

Nil

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

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

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Compound

Element

Solution

Mixture

For diagnosis of goiter in thyroid gland we use

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Co-60

C-14

I-131

Sr-90

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 number of periods is:

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6

7

8

9

________________ in linear in shape.

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CO+

CO2

H2O

NH3

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