Editor
Heat of vapourization will be least when:
Difficulty: Easy
A: 
$NH_{4}OH$ is neutralized with $HNO_{3}` $
B: 
$NH_{4}OH$ is neutralized with $CH_{3}COOH$
C: 
NaOH is neutralized with HCl
D: 
NaOH is neutralized with $CH_{3}COOH$