How is chemically pure water obtained in the laboratory?

How is O_2 obtained in the laboratory?

For pure water:

How is pure acetone prepared in the laboratory?

How is Cl_2 obtained in the laboratory ? Describe its important properties and uses.

How would you prepare carbon dioxide in the laboratory? Describe its acidic nature and the action on lime water. What is photosynthesis ?

How is chlorobenzene prepared in the laboratory and on a large scale ?

State the colour of - (i) pure nitric acid (ii) nitric acid obtained in the laboratory (iii) nitric acid obtained in the laboratory after passage of air or addition of water to it .

How is dihydrogen prepared in the laboratory in pure form,

How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

An easy way of obtaining Cl_2 gas in the laboratory is :