(a) Draw the structures of the following molecules :
(i) `N_(2)O_(5)`
(ii) `HCIO_(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.

Explanation

(a) (i) `N_(2)O_(5)`

(ii) `HClO_(4)`

(b) (i) `H_(2)S` is more easily donates a proton and is therefore more acidic.
(ii) Fluorine does not exhibit any positive oxidation state because flourine is the most electronegative element .
(iii) Helium forms no real chemical compound , due to small size and high ionization enthalpy of helium .