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JEE Advanced2013Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of

Options

  1. ANO
  2. BNO 2
  3. CN 2 O
  4. DN 2 O 4

Correct answer

B. NO 2

Step-by-step solution

Nitric acid decomposes in sunlight as per reaction 4 HNO 3 ⟶ 4 NO 2 + 2 H 2 O + O 2 g Yellow colour is due to dissolved NO 2 (liq.) NO 2 (g) is brown in colour but it is yellow in dissolved form.

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