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

The rusting of an iron object is called:

A mixture of sulphur and carbon disulphide is:

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

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