(a) Draw the structures of the following molecules :

(i) ${N}_{2}{O}_{5}$                             (ii) $HCI{O}_{4}$

(b) Explain the following observations :

(i) ${H}_{2}S$ is more acidic than ${H}_{2}O.$

(ii) Fluorine does not exhibit any positive oxidation state.

(iii) Helium forms no real chemical compound.

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