When conc. H₂SO₄ is added to dry KNO₃,brown fumes are evolved.These fumes are

When Conc Hso Is Added To Dry Kno Brown Fumes Chemistry QuestionWhen Conc Hso Is Added To Dry Kno Brown Fumes Chemistry Question

When conc. H₂SO₄ is added to dry KNO₃, brown fumes are evolved. These fumes are of

Options

(a) SO₂
(b) SO₃
(c) NO
(d) NO₂

Correct Answer:

NO₂

Explanation:

When heated with conc. H₂SO₄ potassium nitrate undergoes double decomposition reaction forming free nitric acid. Some of the nitric acid gets decomposed to give brown fumes of nitrogen dioxide. KNO₃ + H₂SO₄ → KHSO₄ + HNO₃. 4HNO₃ → 4NO₂ + 2H₂O + O₂.

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