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

Which of the following oxides acts as a mixed anhydride (i.e., produces two different acids upon hydrolysis)?

Options

  1. ANO ₂
  2. BN ₂ O ₅
  3. CSO ₃
  4. DCl ₂ O ₇

Correct answer

A. NO ₂

Step-by-step solution

A mixed anhydride is an oxide that reacts with water to form a mixture of two different acids. Let us examine the hydrolysis reactions of the given oxides: N ₂ O ₅ + H ₂ O 2 HNO ₃ (yields only nitric acid) SO ₃ + H ₂ O H ₂ SO ₄ (yields only sulfuric acid) Cl ₂ O ₇ + H ₂ O 2 HClO ₄ (yields only perchloric acid) 2 NO ₂ + H ₂ O HNO ₂ + HNO ₃ (yields a mixture of nitrous acid and nitric acid) Therefore, NO ₂ is a mixed anhydride. Answer: NO ₂

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