Question # 1

The repetition of a property after a certain interval is:

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Periodicity

Properties

Periodicity of properties

None

..................... is property of metals.

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Gases

Lustrous

Solids

Nil

Carbon forms ____________ bonds in diamonds.

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4

3

6

9

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

Energy of a shell is ________________

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Variable

Constant

Cannot be changed

Nil

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

The property of being polar in nature is called:

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Polarity

Chemistry

Both

Nil

At ____________ °C water converts to ice.

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101°

100°

99°C

100.2°C

The example of solid solute in gas solvent is

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butter

Sugar in water

Smoke in air

Opals

4^th and 5^th period of the long form of periodic table are called

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short periods

Normal periods

Long periods

Very long periods

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

Which one an example of heterogeneous mixture?

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Ice cream

Concrete

Both a & b

NiL

Which one is moderate reactive metal?

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Pb

Na

Ca

Mg

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