Charcoal

Q.

What is acid rain? Write balanced reactions to explain its formation. How does acid rain affect a marble statue?

Q. Identify the uses of animal charcoal.

1. Purification of sugar
2. Making paints
3. Making gas masks
4. Shoe polish

Q. What are the amorphous allotropes of carbon?

Q. Sugar charcoal is obtained by adding concentrated to cane sugar.

1. sulphuric acid
2. sodium hydroxide
3. hydrochloric acid

Q. nt20 ml of 0.1 M solution of compound Na2CO3.NaHCO3.2H2O is titrated against 0.05M HCl, x mL of HCl is used when phenolphtalein is used as an indicator and y mL of HCl is used when methyl orange is the indicator in two separtate titrations. What is the value of (y-x)?n

Q.

How is Bone charcoal prepared?

Q. On adding a compound X to a solution of red litmus, Aman observed that the solution turned colourless. Identify X.

1. Limestone
2. Activated charcoal
3. Sodium hydroxide
4. Sulphuric acid

Q.

A student put a drop of the reaction mixture of a saponification reaction first on blue litmus paper and then on red litmus paper. He may observe that:

1. There is no change in the blue litmus paper and the red litmus paper turns white.

2. There is no change in the red litmus paper and the blue litmus paper turns red.

3. There is no change in the blue litmus paper and the red litmus paper turns blue.

4. No change in color is observed in both the litmus paper.

Q. The raw materials used to prepare charcoal are:

1. wood
2. bone
3. sugar
4. plastic

Q.

Write F for true and for false for the following statements

Charcoal is used in the purification of water.

1. True
2. False