NCERT Solutions of Materials : Metals and Non-Metals Class 8
<< IntroductionNCERT Solution - Part 1 >>

Materials : Metal and Non-metals

Chemical Properties of Metals and Non-metals

Reaction of metals with oxygen:

Metals form their oxides when react with oxygen.

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Metal oxides are basic in nature.

Example -

Reaction of Iron metal with oxygen

When iron reacts with moist air, it forms rust. Rust is iron oxide. Articles made of iron, such as grills, fencing, etc. are get rusted because of reaction with moist air.

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Rust is reddish brown in colour and is iron oxide.

Iron oxide is basic in nature. It turns red litmus blue.

Reaction of Magnesium metal with oxygen:

When magnesium is burnt in air, it forms magnesium oxide. Burning in air means reaction with oxygen.

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Magnesium oxide forms magnesium hydroxide with water. Solution of Magnesium oxide turns red litmus paper blue. This means magnesium oxide is basic in nature.

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Reaction of Non-metals with oxygen:

Non-metals forms their oxides when react with oxygen.

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Thus,

Non-metal forms their oxide when reacts with oxygen.

Non-metal oxides are acidic in nature.

Example -

Reaction of sulphur with oxygen

When sulphur is burnt in air, it forms sulphur dioxide.

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Solution of sulphur dioxide turns blue litmus paper red. Sulphur dioxide forms sulphurous acid when dissolved in water. Thus, sulphur dioxide is basic in nature.

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Reaction of carbon with oxygen

When carbon is burnt in air, it forms carbon dioxide. You can observe that when coal (carbon) is burnt it forms smoke, which contains carbon dioxide.

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Carbon dioxide is basic in nature. The solution of carbon dioxide in water turns blue litmus paper red.

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Reaction of Metals and Non-metals with water:

Generally, metals form respective hydroxides when they react with water.

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Reaction of sodium metal with water:

Sodium metal vigorously reacts with water and forms sodium hydroxide along with lot of heat.

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Reaction of potassium with water:

Potassium metal vigorously reacts with water and forms potassium hydroxide along with lot of heat.

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Non-metals generally do not react with water. Rather some non-metals which react with air vigorously are stored in water.



NCERT Solutions of Materials : Metals and Non-Metals Class 8
<< IntroductionNCERT Solution - Part 1 >>

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