In the ring test of NO₃^– ion, Fe²⁺ ion reduces nitrate ion to nitric oxide, which

combines with Fe²⁺ (aq) ion to form brown complex. Write the reactions involved in the formation of brown ring.

SF₆ is known but SCl₆ is not. Why?

On reaction with Cl₂, phosphorus forms two types of halides ‘A’ and ‘B’. Halide A is yellowish-white powder but halide ‘B’ is colourless oily liquid. Identify A and B and write the formulas of their hydrolysis products.

Explain why the stability of oxoacids of chlorine increases in the order given below:

HClO< HClO₂< HClO₃< HClO₄

Explain why ozone is thermodynamically less stable than oxygen.