Question

State the colour of
1) pure nitric acid
2)nitric acid obtained in laboratory
3)nitric acid obtained on the passage of air or addition of water

Answer 1

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1. Pure nitric acid is colourless.
2. Nitric acid obtained in laboratory is pale yellow in colour due to decomposition into oxides of nitrogen and water
3. Pale yellow colour of nitric acid disappears and hence it becomes colourless, on passage of air or addition of water.