.k question answer part -25

  G.k question answer part -25:

1. Which gas is used in place of nitrogen for breathing in deep water divers?

Ans: Helium

2. Which gas is used in different types of welding?

Ans : Oxygen and acetylene.

3. What is silicon carbide used for?

Ans : To cut very strong things.

4. What is the average salinity in sea water?

Ans : 3.5%

5. What are the main components of pearls?

Ans: Calcium carbonate and magnesium carbonate

6.What is amalgam?

Ans: Alloy, one of the elements of which is mercury

7.What is the lightest metal?

Ans: Lithium

8.What is potassium nitrate used for?

Ans: Chemical fertilizers

9.What is in white water?

Ans : Carbon dioxide

10.What is the most important shape of aluminum?

Ans : Bauxite

11. Which thing dissolves the most in water?

Ans: Sugar

12. What household products produce chlorofluorocarbon gas?

Ans: Refrigerator, AC machine

13.What gas is filled in the gas balloon?

Ans: Helium

14.Which metal is not used in coins among zinc, copper, lead, silver?

Ans : Lead

15.Which metal pollutes the air of big cities?

Ans : Lead

16.Bell metal is made of which metal?

Ans: Tin and copper

17.The chemical (ethyl mercaptan) which is added to the cooking gas to make it smelly is a compound of which substance?

Ans : Brimstone

18.Which element is mandatory in any acid?

Ans : Hydrogen

19.What is used in non-stick cookware?

Ans : Teflon

20.What is the shape of menageite?

Ans : Therium

21.What is called carbon, diamond and graphite together? Ans : Allotropes.

22. What is laughing gas?

Ans : Nitro