How diborane is prepared in the laboratory?

How sodium carbonate is prepared in the laboratory? Write the reaction involved in the process.

How potassium permanganate is prepared in the laboratory?

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

How pure N_2 gas is prepared in laboratory? Write the necessary equation for the reaction.

Can coal, petroleum and natural gas be prepared in the laboratory from dead organisms ?

How borazine is prepared from diborane?

How is baking soda prepared?

How borax is prepared from colemanite?

Non-Stoichiometric cuprous oxide, Cu_2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2:1. Can you account for the fact that this substance is a p-type semiconductor?