Chemistry Past Questions and Answers

Group VII elements are

Which of the following is used to study the arrangement of particles in crystal lattices?

I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?

The chemicals used to soften hard water involves the addition of

Chlorination of water for town supply is carried out to