The heats of neutralisation of four acids `a`, `b`, `c` and `d` when neutralised against a common base are `13.7`, `9.4`, `11.2` and `12.4` kcal respectively. The weakest among these acids is

The heats of neutralisation of four acids A, B, C and D are 13.7, 9.4, 11.2 and 12.4 kcal respectively when they are neutralised against a common base. The weakest acid among A,B,C and D is-

The heats of neutralisation of four acids A, B, C, D are -13.7, -9.4, -11.2 and -12.4 kcal respectively when they are neutralised by a common base. The acidic character obeys the order:

The heats of neutralisation of four acids A,B,C and D are -13.7,-9.4,-11.2 and -12.4kcal respectively, when they are neturalised by a common base. The acidic character obeys the order :

The heats of neutralisation of four acids A,B,C and D are -13.7,-9.4,-11.2 and -12.4kcal respectively, when they are neturalised by a common base. The acidic character obeys the order :

(a) The measured heats of neutralization of acetic acid, formic acid, hydrocyanic acid, and hydrogen sulphide are 13.20, 13.40, 2.90 and 3.80 KCal per g.equiv. respectively. Arrange these acids in a decreasing order of strength. (b) Heat of neutralization of formic acid by NH_(4)OH is 11.9 KCal per g.equiv. What is the heat of ionization of NH_(4)OH ?