glycerine || Some useful chemicals

some useful chemicals||Glycerine||Sodium bicarbonate || sodium carbonate || uses of glycerine || properties of sodium bicarbonate

1. What is collected at cathode and at anode during electrolysis of water?

Ans: Hydrogen gas is collected at cathode (-ve electrode) and oxygen gas is collected at anode (+ve electrode) during electrolysis of water. 

2. What do you know about sodium carbonate?

Ans: Sodium carbonate is a compound with molecular formula (Na₂CO₃). It is also called washing soda. It is water powder and alkaline in nature. 

3. List the uses of sodium carbonate.

Ans: The following are the uses of sodium carbonate:

1. It is used to prepare glass, soap, etc.
2. It is used to remove permanent hardness of water.
3. It is used in preparing paper.
4. It is used to prepare caustic soda in laboratory.

4. Write any three properties of soium bicarbonate.

Ans: The following are the properties of sodium bicarbonate:

1. It is found in solid form with white colour.
2. It is soluble in water.
3. It forms the baking powder.

5. How is baking powder prepared?

Ans: When sodium bicarbonate (NaHCO₃₎ is mixed with potassium hydrogen tartrate then baking powder is formed. 

6. Why is baking kept in rice or bakery items?

Ans: Baking powder is edible and makes the food item thicker than its original form. So, it is used in preparing rice in hotels and to prepare biscuits, cake, bread, etc. 

7. List out the uses of sodium bicarbonate?

Ans: The following are the uses of sodium bicarbonate:

1. It is used to prepare baking powder.
2. It is used as medicine of acidity in our body.
3. It is used in fire extinguisher.

8. How is glycerol formed?

Ans: Gylcerol is formed from the organic compound propane. 

9. Write the molecular formula of glycerol.

Ans: The molecular formula of glycerol is C₃H₅(OH)₃. 

10. What are the uses of glycerin?

Ans: The following are the some uses of glycerin:

1. It is used to prepare medicine, ink of stamp pad, printing ink, etc.
2. Higher quality of bathing soap is made from glycerine.
3. It is used to avoid the dryness of skin.
4. It is used to preserve the fruits and foods with its freshness.

11. Why do we use glycerine during winter season?

Ans: We know that glycerine is a lubricating substance that reduces the friction. So, it avoids the dryness of skin and we use in winter season.