Nitric acid turns a paper soaked in potassium iodide solution brown due to liberation of

In the combined state, HNO₃ is found in the form of metallic

In the free state, is found in rain water, where it occurs in traces after lightning.

Con. HNO₃ gives ________ fumes on heating.

_________ is a non volatile acid and produces volatile HNO₃ on reacting with potassium nitrate or sodium nitrate.

Conc.HNO₃ (1 part by volume) when mixed with Con. HCl (3 part by volume) gives a mixture called

Aqua regia is a mixture of

_________ is very strong mono basic acid.

Nitric acid is manufactured by

The __________ of nitroso ferrous sulphate decomposes on disturbing the test tube.