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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Ammonia is dried over
  • ✓
    Quick lime
  • B
    Slaked lime
  • C
    Anhy. $CaC{l_2}$
  • D
    None of these
✓

Answer

Correct option: A.
Quick lime
a
Ammonia is prepared by heating a mixture of calcium hydroxide and ammonium chloride.

$Ca ( OH )_2( s )+2 NH _4 Cl ( s ) \rightarrow CaCl _2( s )+2 H _2 O ( l )+2 NH _3( g )$

Concentrated sulphuric acid conc. $H _2 SO _4$ and anhydrous calcium chloride $CaCl _2$ are not used to dry ammonia because they react with it. The gas is passed through fresh quicklime (solid calcium oxide lumps) to effectively dry it. Ammonia is collected by upward delivery as it is lighter than air.

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$\begin{matrix}
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   \,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,  \\
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