Nitric acid is generally colourless- What gives it a yellowish shade-Solubility in waterDecomposition in the presence of lightStrong acidic natureFormation of azeotropic mixture

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Standard IX

Chemistry

Physical Properties of Nitric Acid

Nitric acid i...

Question

Nitric acid is generally colourless. What gives it a yellowish shade?

Solubility in water

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Decomposition in the presence of light

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Strong acidic nature

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Formation of azeotropic mixture

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Solution

The correct option is B Decomposition in the presence of light
The decomposition of concentrated nitric acid takes place in room temperature when initiated with absorption of light energy. It decomposed to nitrogen dioxide, water and oxygen thus giving a brownish yellow shade.
$4 H N O_{3}^{p r e s e n c e o f l i g h t - ------------ \to} 2 H_{2} O + 4 N O_{2} + O_{2}$

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Similar questions

(a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?

(b) Write the equation for the reaction of dilute nitric acid and conc. nitric acid with copper.

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. (i) Dilute nitric acid is generally considered to be a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?
(ii) Write the equation for the reaction of dilute nitric acid with copper.
(iii) Account for the yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.

Q. Nitric acid is generally colourless. What gives it a yellowish shade?

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

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