Question

Laboratory preparation of ammonia involves heating of ammonium chloride with slaked lime in the ratio:

• A. 1:2
• B. 2:3
• C. 3:2
• D. None

Answer 1

The correct option is C 3:2

Think about the hint for a moment and look at the options. In what way, is option (C) different from the first two? In the case of option C, slaked lime (aq) is limiting isn’t it?
In other words, slaked lime can all get easily used up while the remaining ammonium chloride can easily be separated from the reaction mixture.
$2N{H}_{4}Cl+Ca(OH{)}_2\to 2N{H}_3+CaC{l}_2+2H_{2}O$