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Physical Properties

State, what i...

Question

State, what is observed when nitric acid is kept in a reagent bottle for a long time.

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Solution

When nitric acid is stored for a long time in a reagent bottle, some of it decomposes to form brownish nitrogen dioxide that dissolves again in the acid to give it a yellowish colour.

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Q. What is observed when nitric acid is kept in a reagent bottle for a long time?

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.

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.

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.

Explain the following:

Concentrated nitric acid appears yellow when it is left standing in a glass bottle.

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