What is the unit of molar mass?

Define alkalies and give an example.

In a basic aqueous solution,what happens to the basicity of the solution as the concentration of $[OH^-]$ increases?

The compound which is used in glass, soap, and paper industries is:

Crystals of copper sulphate are heated in a test tube for some time.
$(a)$ What is the colour of copper sulphate crystals:
$(i)$ before heating, and $(ii)$ after heating?

$A$ sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the $pH$ paper yellowish-orange. Which of the following would change the colour of this $pH$ paper to greenish-blue?