Which of the following elements have got their names from colour? (i) Chlorine (ii) Chromium (iii) Curium (iv) Polonium

Match the changes in physical states in column A with the name of the corresponding process in column B: (i) liquid to gas (ii) solid to liquid (iii) solid to gas (iv) gas to solid, matched with (a) condensation (b) vaporisation (c) melting (d) sublimation.

Which of the following gases are obtained during the electrolysis of acidified water?

Which of the following is not a metal?

Analyse the given table and choose the correct option. (Substance P turns blue litmus red, no change to red litmus; Substance Q no change to blue litmus, turns red litmus blue; Substance R causes no change to either litmus.)