Q9 / 200 · WBJEE 2013 · Chemistry

Nitric acid can be obtained from ammonia via the formations of the intermediate compounds

  • Correct answer
    A
    nitric oxide and nitrogen dioxide
  • B
    nitrogen and nitric oxide
  • C
    nitric oxide and dinitrogen pentoxide
  • D
    nitrogen and nitrous oxide

Solution

Ostwald process of for manufacture of nitric acid, $4 \mathrm{NH}_{3}+\mathrm{SO}_{2} \frac{\mathrm{Pt} \text { gauge }}{800-900^{\circ} \mathrm{C}} \underset{\text { nitric oxide }}{4 \mathrm{NO}}+6 \mathrm{H}_{2} \mathrm{O}$ $$ \Delta H=-21.5 \mathrm{kcal} $$ $2 \mathrm{NO}+\mathrm{O}_{2} \stackrel{50^{\circ} \mathrm{C}}{\longrightarrow} \quad 2 \mathrm{NO}_{2}$ $4 \mathrm{NO}_{2}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \longrightarrow \underset{\text { nitric acid }}{4 \mathrm{HNO}_{3}}$

Hence, the correct answer is option: 'A'.

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