The chemical formula of Plaster of Paris is:

Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles can _____.

Which of the following is not a bleaching agent?

1. Sodium hypochlorite
2. Calcium hypochlorite
3. Hydrogen peroxide
4. Hydrogen sulphide

The instrument used to regulate temperature to a particular degree is called:

1. Thermostat

2. Thermometer

3. Pyrometer

4. Thermocouple

Human nails are made up of:

1. Pigment
2. Elastin
3. Albumin
4. Keratin

Pressure is measured terms of:

1. Mass and Density

2. Work Done

3. Force and Area

4. Force and Distance

Which of the following substances cause temporary hardness in water?

$1. Mg{\left(HC{O}_3\right)}_2$

$2. Ca{\left(HC{O}_3\right)}_2$

$3. CaC{l}_2$

$4. MgS{O}_4$

Select the correct answer using the code given below.