Materials Metals and Non Metals - Exemplar Solutions 2

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

VERY SHORT ANSWER QUESTIONS
13. Name two soft metals which can be cut with a knife.
Ans. (i) sodium (ii) potassium

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

15. Name two major non-metals which are present in fertilisers and enhance the growth of plants.
Ans. (i) nitrogen (ii) phosphorus

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

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

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.

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

20. Which liquid metal is used for making thermometers?
Ans. Mercury

21. Which of the following metals can displace the other two metals from their salt solutions?
zinc, iron, copper
Ans. Zinc