Which of the following are physical changes?

(i) melting of iron metal

(ii) rusting of iron metal

(iii) bending of an iron rod

(iv) drawing wire of iron metal

A mixture of sulphur and carbon disulphide is:

Tincture of iodine has antiseptic properties. This solution is made by dissolving:

Which of the following are chemical changes?

(i) decaying of wood

(ii) burning of wood

(iii) sawing of wood

(iv) hammering of nail into wood

Many indigestion mixtures are suspensions. What do the instructions written on the bottle of an indigestion mixture tell us before taking the mixture, and why?