Question # 1

Compustion is a.

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Physical Change

Chemical change

Thermal change

None of these

During combustion, a substance reacts with

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Hydrogen

Water

Oxygen

Carbon di oxide

Freezing of a liquid is a

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Chemical change

Chemicla property

Physical change

None of these

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

What are teh products when electric current is passed through water.

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Only steam

Hydrogen and steam

Hydrogen and oxygen

Oxygen and steam

Zince oxide is ............... solid substances.

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Red

White

Yellow

Blue

Original colur or Nichrome wire is.

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Silver grey

Red hot

White hot

None of these

A gas produced on heating solid potassium chlorate is.

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Hydrogen

Carbon dioxide

Oxygen

Methane

Select all that happen during a chemicla change.

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A temporary chagne occurs.

Composition of the substanes is changed.

Propertis of the sbstances are changed.

New substances with different properties are formed.

The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is.

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Melting point

Boiling point

Freezing point

Highest temperature.

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