NCERT · Class 10 · Science

Chapter 3: Metals and Non-metals

Practice each question, then open the answer or worked solution.

In-text questions set 4

Textbook page 53 · 3 questions

Q1Written answer

Define the following terms.

(i) Mineral

(ii) Ore

(iii) Gangue

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Worked solution

Minerals are compounds (also known as elements) which are found naturally in the earth’s crust. E.g. Alums, K₂SO₄.Al₂(SO₄)₃.24H₂O, etc.
Ores are minerals from which metal can be extracted Ex: Bauxite Al₂O₃.2H₂O is the ore of Al, copper pyrite CuFeS₂. All minerals are not considered as ores but all ores are also minerals.
Ores mined from the earth are naturally contaminated with sand, rocky materials. There are impurities present in the ore which are known as gangue.

Q2Written answer

Name two metals which are found in nature in the free state

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Worked solution

Solution: Gold and platinum are the two metals found in free state in nature.

Q3Written answer

What chemical process is used for obtaining a metal from its oxide?

Reduction method is used to obtain metal from its oxide. Ex: Zinc oxide is reduced to metallic zinc by heating with carbon.

ZnO + C → Zn + CO

Ex: Lead oxide is reduced to lead by heating with carbon

PbO +C → Pb + CO

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Worked solution

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