Account for the following: (a) Sulphurous acid is a reducing agent (b)Fluorine forms only one oxoacid (c) Boiling point of noble gases increases from He to Rn.

Which factor is most responsible for the increase in boiling points of noble gases from He to Xe?

Account for the following (i) Fluorine forms only one oxoacid HOF (ii) Sulphur is paramagnetic is vapour state.

(a) Account for the following : (i) Ozone is thermodynamically unstable. (ii) Solid PCl_(5) is ionic in nature. (iii) Fluorine forms only one oxoacid HOF. (b) Draw the structure of (i) BrF_(5) (ii) XeF_(4)

(a) (i) Write the disproportionation reaction of H_(3)PO_(3) (ii) Draw the structure of XeF_(4) (b) Account for the following: (i) Although Fluorine has less negative electron gain enthalpy yet F_(2) is strong oxidizing agent. (ii) Acidic character decreases from N_(2)O_(3) to Bi_(2)O_(3) , in group 15. (c) Write a chemical reaction to test sulphur dioxide gas. Write chemical equation involved.