100+ Science Carbon and Its Compounds Quiz Online Test - 2

Question: 6

Mention the uses of diamond?

Diamond is used in jewellery since it sparkles in light.

Black diamond is used for cutting glass, sawing marbles and drilling rocks.

Diamond is used in high precision thermometers.

Question: 7

Mention the uses of carbon dioxide?

Carbon dioxide is used as a fire extinguisher

It is used in the manufacture of sodium carbonate. (washing soda) and sodium bicarbonate (baking soda)

It is used for making aerated soft drinks

It is used by green plants to prepare food during photosynthesis.

Dry ice is used as refrigerant

Liquid CO₂ is used in sugar industry

Question: 8

What is fermentation?

Milk turns into curd by the action of enzymes. This chemical change is called fermentation.

Question: 9

Why is graphite used as a lubricant?

Graphite is soft and slippery. So, it is used as a lubricant in the fast moving machinery.