Pure nitric acid is colourless but the acid obtained in the laboratory is slightly yellow. The yellow colour is due to___.

The dissolution of NO in the acid.

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The dissolution of N₂O in the acid.

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The dissolution of NO₂ in the acid.

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The dissolution of N₂O₅in the acid.

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Solution

The correct option is C
The dissolution of NO₂ in the acid.

Pure nitric acid is colourless but the acid obtained in the laboratory is slightly yellow. The yellow colour is due to dissolution of reddish brown coloured nitrogen dioxide gas in the acid. This gas is produced due to the thermal decomposition of nitric acid.

$4 H N O_{3} \to 2 H_{2} O + 4 N O_{2} + O_{2}$

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Similar questions

Pure nitric acid is colourless but the acid obtained in the laboratory is slightly yellow. The yellow colour is due to_____________.

Nitric acid obtained in the laboratory is slightly yellow. The yellow colour of the acid is removed by addition of excess of oxygen gas.

N O_{2}

Question 21.
Which of the following is used for dissolution of gold ?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Aqua regia

H N O_{3}

N O_{2}

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