Washing soda is used ______.
I. for removing permanent hardness of water
II. for disinfecting drinking water
III. as a cleaning agent for domestic purpose

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

Match the following :

Which one of the following types of glasses is used for making optical instruments?

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.