Temporary Hardness of Water and Removal

Q.

Explain why glycerine is more viscous than water?

Q. Part of a soap that dissolves in water is known as:

1. Hydrophilic
2. Water resistant
3. Hydrophobic
4. Micelles

Q. Temporary hardness of water is due to of calcium and magnesium and it can be removed by.

1. sedimentation
2. boiling
3. sulphates
4. bicarbonates

Q.

How can we remove hardness in temporary hard water?

Q.

Temporary and permanent hardness of water can be removed by:-

1. For temporary hardness:- ${\text{Na}}_2{\text{CO}}_3$

   For permanent hardness:- ${\text{Ca(OH)}}_2$

2. For temporary hardness:- ${\text{Ca(OH)}}_2$

   For permanent hardness:- Boiling

3. For temporary hardness:- Boiling

   For permanent hardness:- ${\text{Ca(OH)}}_2$

4. For temporary hardness:- Boiling

   For permanent hardness:- ${\text{Na}}_2{\text{CO}}_3$

Q.

Saturation with which of the following substances will produce hard water?

1. Saturation of water with
2. Saturation of water with
3. Saturation of water with
4. Addition of to water

Q.

The temporary hardness of water is due to the presence of:

1. Calcium chloride

2. Magnesium bicarbonate

3. Calcium carbonate

4. Magnesium sulphate