Materials Metals and Non Metals - Exemplar Solutions 2

CBSE Class 8 Science
NCERT Exemplar Solutions
CHAPTER 4
Materials: Metals and Non-Metals

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VERY SHORT ANSWER QUESTIONS

13. Name two soft metals which can be cut with a knife.

Ans. (i) sodium (ii) potassium

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14. Which non-metal is essential for our life and all living beings inhale it during breathing?

Ans. Oxygen gas

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15. Name two major non-metals which are present in fertilisers and enhance the growth of plants.

Ans. (i) nitrogen (ii) phosphorus

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16. Which non-metal is used to disinfect water?

Ans. Chlorine

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17. A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

Ans. iodine

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18. Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

Ans. No, because displacement reaction does not take place.

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19. Why are bells made of metals?

Ans. Bells are made of metal because metals are sonorous(produce sound while strick on it).

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20. Which liquid metal is used for making thermometers?

Ans. Mercury

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21. Which of the following metals can displace the other two metals from their salt solutions?

zinc, iron, copper

Ans. Zinc