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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Match the reactants or stages of the Ostwald process given in List-I with their corresponding catalysts, conditions, or products given in List-II. List-I List-II (A) NH₃ + O₂ (I) Recycled NO gas (B) NO + O₂ (II) Pt / Rh gauge catalyst at 500 ~K (C) NO₂ + H₂O (III) Concentrated H₂SO₄ (D) Aqueous HNO₃ ( 68 % by mass) (IV) NO₂ gas Choose the correct answer from the options given below:

Options

  1. A(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
  2. B(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
  3. C(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
  4. D(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

Correct answer

A. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)

Step-by-step solution

The Ostwald process involves the following sequential steps and conditions: (A) The first step is the catalytic oxidation of ammonia by atmospheric oxygen. This reaction requires a Pt / Rh gauge catalyst at 500 ~K and 9 bar pressure. Hence, (A) matches with (II). (B) The second step is the oxidation of nitric oxide ( NO ) to nitrogen dioxide ( NO₂ ) gas. Hence, (B) matches with (IV). (C) The third step is the absorption of NO₂ in water to form aqueous HNO₃ and a byproduct, NO gas, which is recycled. Hence, (C) matc

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