Name the following:
A substance which gives yellow coloured complex compound with nitric acid.

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Solution

Concentrated nitric acid $({HNO}_{3})$ is a potent oxidizer and corrosive acid.
Nitric acid reacts with proteins to produce a yellow substance.
When conc. nitric acid gets into touch with our skin, it combines with the proteins in our skin, namely keratin, to generate xanthoproteic acid, a yellow-colored substance.
Hence, protein is the substance which gives yellow coloured complex compound with nitric acid.

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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. 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 is yellow in colour when:

Name the following:
A compound which is oxidized by nitric acid in the presence of sulphuric acid and changes its colour from pale green to orange yellow.

Which of the following substance will give a pale yellow colour when tested with methyl orange indicator?

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Name the following:A substance which gives yellow coloured complex compound with nitric acid.

Name the following:
A substance which gives yellow coloured complex compound with nitric acid.