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Nitric Acid

Explain the f...

Question

Explain the following:
Concentrated nitric acid appears yellow when it is left standing in a glass bottle.

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Solution

The pure nitric acid is colourless conc nitric acid undergoes decomposition as it is very unstable to heat. On decomposition they form reddish brown nitrogen dioxide gas which when dissolved in the acid appears yellow in colour.

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Q. The colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle is :

Q. Explain the following :
i)

D i l . H N O_{3}

is generally considered a typical acid but not so in the reaction with metals.
ii) Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
iii) In the laboratory preparation of nitric acid an all-glass apparatus is used.

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. Explain why [4 MARKS]
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid, when kept in a reagent bottle for a long time, turns yellow.

Explain why

(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.

(b) Nitric acid is kept in a reagent bottle for a long time.

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