What are the composition of classical smog?

What are composition of cement?

Write the composition of brass.

Write the composition of mischmetal.

What is the composition of tincture of iodine?

Write the composition of German Silver.

The vapour pressure of pure liquid A and B are 450mm and 700mm of Hg respectively at 350 K. Calculate the composition of liquid mixture if total vapour pressure is 600mm of Hg also find the composition of the mixture in vapour phase.

Give the percentage composition of the following in human body: Hydrogen

Give the percentage composition of the following in human body: Calcium