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Aqua Regia and Its Uses

Explain why n...

Question

Explain why nitric acid is kept in reagent bottle for a long time?

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Solution

Nitric acid decomposes when exposed to light as:
4HNO₃ → 4NO₂ + 2H₂O + O₂

The NO₂ thus formed dissolves in nitric acid to give a yellow brown appearance.
Hence nitric acid is stored in a brown bottle.

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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. State, what is observed when 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.

Explain the following:

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

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Aqua Regia and Its Uses

Standard IX Chemistry

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