Write any two oxoacids of sulphur and draw their structures.

Arrange the following in increasing order of their acidic character:

Ethanol, phenol, water

Complete and balance the following equation:

(a) NH₃ (excess) + Cl₂

(b) XeF₆ + 2H₂O

OR

Write balanced chemical equations involved in the following reactions:

(a) XeF₄ reacts with SbF_5.

(b) Ag is heated with PCl_5.

Write the names of two fuels other than hydrogen used in fuel cell. Write two advantages of fuel cell over an ordinary cell.

Give reasons for the following:

a) Acidic character decreases from N₂O₃ to Bi₂O_3.

b) All the P-Cl bonds in PCl₅ are not equivalent.

c) HF is a weaker acid than HCl in an aqueous solution.