Question # 1

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

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Red

White

Yellow

Blue

A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is.

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Iron oxide

Iron sulphide

Iron Chloride

Iron Hydride

A physical change occurs when.

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Iron rusts

Solution of common salt is heated

A piece of wood burns

Sygar us geated strongly

Chemical reaction of oxygen with other substances is called.

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Oxidation

Reduction

Rusting

None of these

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

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.

Formation of steam from water is example of.

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Chemical change

Physical Change

Both of these

None of these

Product fo combustion is.

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C

O2

CO2

All of these

A gas produced on heating solid potassium chlorate is.

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Hydrogen

Carbon dioxide

Oxygen

Methane

Freezing of a liquid is a

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Chemical change

Chemicla property

Physical change

None of these

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