Q18 / 180 · COMEDK 2019 · Chemistry

To dry ammonia gas the drying agent used is

  • A
    con(c)$\mathrm{H}_{2} \mathrm{SO}_{4}$
  • B
    $\mathrm{P}_{2} \mathrm{O}_{5}$
  • Correct answer
    C
    soda lime
  • D
    anhydrous $\mathrm{CaCl}_{2}$

Solution

$\mathrm{NH}_{3}$ (ammonia) gas is dried by using sodalime, because $\mathrm{NH}_{3}$ itself is basic in nature and only basic compound can be used to dry $\mathrm{NH}_{3}$, while conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$, anhy. $\mathrm{CaCl}_{2}$ and $\mathrm{P}_{2} \mathrm{O}_{5}$ can not react with ammonia.

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

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