" 10.Why are halogens coloured? "

(i) Name the scientist whoprepared the first compound of noble gases (ii) Give chemical reactions of HNO_(3) with iodine (iii) Why are halogens coloured ?

(a) Complete the followingh chemical reaction equations : (i) Cu+HNO_(3 (dilute))to (ii) P_4+NaOH+H_2Oto (b) (i) why does R_3P=O exist but R_3N=O does not ? (R=alkyl group) (ii) why is dioxygen a gas but sulphur a solid ? (iii) why are halogens coloured ?

(a) Complete the followingh chemical reaction equations : (i) Cu+HNO_(3 (dilute))to (ii) P_4+NaOH+H_2Oto (b) (i) why does R_3P=O exist but R_3N=O does not ? (R=alkyl group) (ii) why is dioxygen a gas but sulphur a solid ? (iii) why are halogens coloured ?

Why are halogens most reactive ?

Choose the incorrect statement regarding the fact that halogens are coloured ?

Explain why : Halogens are coloured and the colour deepens on moving down in the group from fluorine to iodine.

State true or false halogens are coloured.