Question
Question: Enthalpy of neutralisation of four acids A, B, C and D with NaOH are -10.5, -13.7, -5.9 and -12.7 kc...
Enthalpy of neutralisation of four acids A, B, C and D with NaOH are -10.5, -13.7, -5.9 and -12.7 kcal eq−1 respectively. Out of A, B, C and D strongest acid is
A
C
B
A
C
D
D
B
Answer
B
Explanation
Solution
The strongest acid gives the most exothermic neutralisation. Comparing the magnitudes:
- Acid A: 10.5 kcal
- Acid B: 13.7 kcal
- Acid C: 5.9 kcal
- Acid D: 12.7 kcal
Acid B has the highest magnitude (13.7 kcal), so it is the strongest acid.