Q58 / 200 · Manipal (MET) 2010 · Chemistry

Ammonia is dried over

  • A
    slaked lime
  • B
    calcium chloride
  • C
    phosphorus pentoxide
  • Correct answer
    D
    quick lime

Solution

Quick lime, CaO is used to dry ammonia, as with other given dehydrating agents ammonia reacts. $4 \mathrm{NH}_3+\mathrm{CaCl}_2 \longrightarrow \mathrm{CaCl}_2 \cdot 4 \mathrm{NH}_3$ $4 \mathrm{NH}_3+2 \mathrm{P}_2 \mathrm{O}_5 \longrightarrow 4 \mathrm{NH}_4 \mathrm{PO}_3$ $\mathrm{Ca}(\mathrm{OH})_2$ is never used as dehydrating agent.

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

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