Question

16. Which of the following is heaviest metal?
Pb, As, Al, Ni

17. Which of the following has highest melting point?
Ni, Fe, Pt, W.

18. Which property of cotton makes it suitable for use as clothing in summer?

19. Name the synthetic fibre which resembles wool in its properties.

20. Which material is used for making CDs?

21. Why is rayon called artificial silk?

22. What is used for coating non-stick kitchen wares?

23. Which gas is used as referigerant in fridge and in air conditioner?

24. Why do gold, silver and platinum occur in free state?

25. Camphor disappears without leaving any residue Explain?

Answer 1

HERE ARE YOURS ANSWERS;

◆ 16. Pb

◆ 17. W

◆ 18. It absorbes Sweat or Moisture.

◆ 19. Acrylic

◆ 20. Polycarbonate

◆ 21. It is prepared from cotton but has shine like silk.

◆ 22. Teflon

◆ 23. Freon

◆ 24. Gold, Platinum & Silver are few metals which can be found in free state, because they are not reactive in normal conditions with air, water and other chemicals.

◆ 25. Due to Sublimation.


HOPE IT HELPS

Answer 2

1. Pb

2 W

3. It absorbs moisture

4. Acrylic

5. Polycarbonate

6. It is prepared from cotton but has shine like silk

7. Teflon

8. Freon

9. Freon