Which of the following substances dissolves in carbon disulphide ?

1. Iron
2. Sulphur
3. Sodium chloride
4. Iron sulphide

Name:

(a) a soft metal

(b) a metal which is brittle

(c) a non-metal which is lustrous

(d) a liquid metal

(e) a metal which is a poor conductor of electricity

(f) a non-metal which is a good conductor of electricity

(g) a liquid non-metal

(h) the hardest naturally occurring substance

(i) an inert gas

Write the chemical name of the following and also give their molecular formulae:

(a) Baking soda

(b) Vinegar

(c) Marble

(d) Sand

Define:

(a) Elements

(b) Compounds