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Chemical Properties of Nitric Acid

Why does pure...

Question

Why does pure nitric acid take on a yellowish-brown colour when exposed to light?

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Solution

Due to the presence of dissolved nitrogen dioxide, nitric acid take on a yellowish-brown colour when exposed to light.
Nitric acid contains a substantial amount of dissolved nitrogen dioxide left in the solution with a reddish-brown colour.
It acquires yellow colour due to decomposition into oxides of nitrogen and water.

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Q. Give reasons for the following:
(i) In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
(ii) Commercial nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
(iii) Aluminium does not react with nitric acid of any concentration.
(iv) Conc. nitric acid renders iron passive.
(v) Nitric acid is used in purification of gold.
(vi) Aqua regia dissolves gold and platinum.
(vii) Nitric acid usually does not yield hydrogen from acids.
(viii) Lightning is a blessing in disguise.
(ix) Concentrated nitric acid is brown in colour.
(x) Concentrated nitric acid is a stronger oxidizing agent.

Q. Nitric acid turns into a ___ colour solution when exposed to light.

Q. When exposed to light, colourless Nitric acid turnsdue to the formation of.

Why Nitric acid turns brown on standing?

In the presence of light, nitric acid turns yellowish . Give reason.

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Chemical Properties of Nitric Acid

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