Question # 1

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

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

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Red

White

Yellow

Blue

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

Formation of steam from water is example of.

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Chemical change

Physical Change

Both of these

None of these

During combustion, a substance reacts with

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Hydrogen

Water

Oxygen

Carbon di oxide

Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as.

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Combustion

Rusting

Tarmishing

Dehydration

Product fo combustion is.

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C

O2

CO2

All of these

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

Chemical reaction of oxygen with other substances is called.

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Oxidation

Reduction

Rusting

None of these

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

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