State the cation responsible for turning moist neutral litmus red on reaction with dil. HNO₃.

State why nitric acid is a strong oxidizing agent and yields varying products such as NO, NO₂ on reaction with metals, non-metals etc.

Convert nitric acid to sulphuric acid using a non-metal.

State how you would obtain:

(i) hydrogen

(ii) nitric oxide

(iii) nascent chlorine – from nitric acid.

State the concentration of nitric acid used in each case.