What are the possible oxidation numbers of an element if its atomic number is 17?

What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?

When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?

Which of the following substances is a mixture?