The heats of neutralization of four acids A, B, C and D are -13.7, -9.4, -11.2 and -12.4 kcalmol−1 respectively, when they are neutralized by a common base. The acidic character obeys the order:
A
A > B > C > D
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B
A > D > C > B
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C
D > C > B > A
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D
D > B > C > A
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Solution
The correct option is B A > D > C > B The enthalpy of neutralization (ΔHn) is the change in enthalpy that occurs when one equivalent of an acid is neutrilized with one equivalent of a base to form water and a salt. Lower is heat of neutralization, more is heat of dissociation of acid, weaker is acid.