Identify $A, B, C, D$ and $E$.
$(1999,5 M)$
In given scheme : $A=\mathrm{Ca}(\mathrm{OH}) _{2}$
$B=\mathrm{NH} _{4} \mathrm{HCO} _{3}, C=\mathrm{Na} _{2} \mathrm{CO} _{3}$
$D=\mathrm{NH} _{4} \mathrm{Cl}$ and $\mathrm{E}=\mathrm{CaCl} _{2}$
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