Question

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> How are alkaline pyrogallol solution and nitric oxide used to test the presence of oxygen?

Answer 1

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Alkaline pyrogallol solution turns brown when oxygen is passed through it. [1 mark]

Nitric oxide reacts with oxygen to form a brown-coloured nitrogen dioxide gas. [1 mark]