Draw the structures of the following: H2S2O8

CBSE Class 12
1

a. Draw the structures of the following:
i. H2S2O8
ii. HClO4

b. How would you account for the following:
i. NH3 is a stronger base than PH3.
ii. Sulphur has a greater tendency for catenation than oxygen.
iii. F2 is a stronger oxidising agent than Cl2.

2

a)
(i) image
Peroxodisulphuric acid (H2S2O8)
(ii) image
Perchloric acid( HClO4)

b)
(i) Due to smaller atomic size the density of lone pair electrons on N in NH3 is larger than that of P in PH3. So, NH3 is a stronger Lewis base than that of PH3.
(ii) Because of stronger S-S bonds as compared to O-O bonds, sulphur has a greater tendency for catenation than oxygen.
(iii) It is due to:

  • low enthalpy of dissociation of F-F bond
  • high hydration enthalpy of F-