Write down the composition of air.

What are the main components of air ? Write down the composition of three main gases present in air by volume.

Write down the composition of invar?

Write down the composition of German silver.

Write down the composition of electrolytic mixture used in the extraction of aluminium by electrolytic process. Write the chemical reactions occurring at the electrodes in this process.

Write down the composition of the electrolyte used for the extraction of aluminium by the process of electrolysis. Describe the process of extraction.

Write the composition of brass.

Write the composition of rust?

What is meant by Pancreatic juice? Write down the composition and function of the Pancreatic juice.