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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
In which of these processes platinum is used as a catalyst
  • ✓
    Oxidation of ammonia to form $HN{O_3}$
  • B
    Hardening of oils
  • C
    Production of synthetic rubber
  • D
    Synthesis of methanol
✓

Answer

Correct option: A.
Oxidation of ammonia to form $HN{O_3}$
a
(a)Platinum acts as catalyst in the oxidation of ammonia to form nitric oxide. This reaction is used in the Ostwald’s method of nitric acid preparation

$4N{H_3} + 5{O_2}\mathop {\xrightarrow{{Pt}}}\limits_{750\,^oC} 4NO + 6{H_2}O$

$2NO + {O_2} \to 2N{O_2}$

$4N{O_2} + {O_2} + 2{H_2}O \to 4HN{O_3}$

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