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Nitric Acid

Nitric acid i...

Question

Nitric acid is yellow in colour when:

A

freshly prepared

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B

dissolved oxides of nitrogen are present

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C

water is dissolved

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D

None of the above

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Solution

The correct option is A dissolved oxides of nitrogen are present
Red fuming nitric acid contains substantial quantities of dissolved nitrogen dioxide leaving the solution with a reddish brown color. It acquires yellow color due to decomposition into oxides of nitrogen and water.

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Q. Nitric acid is yellow in colour when freshly prepared.

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. The brownish yellow colour of nitric acid is removed by :

Q. Give reasons for the following:
Commercial concentrated nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
Give one chemical test for nitric acid.

Q. Conc. Nitric acid prepared in laboratory is yellow in colour why? How is this colour removed?

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