MCQ
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $-57 kJ mol ^{-1}$ 
Reason (R): Enthalpy of neutralisation is the $H ^{+}$ amount of heat liberated when one mole of H ions furnished by acid combine with one mole of ${ }^{-} OH$ ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below.
  • A
    (A) is true but (R) is false 
  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • C
    (A) is false but (R) is true 
  • D
    Both (A) and (R) are true but (R) is not the correct explanation of (A)

Answer

Correct option: B.
Both (A) and (R) are true and (R) is the correct explanation of (A)
(B)
Enthalpy of neutralization of SA & SB is always –57 kJ / mol because strong monoacid gives one mole of $H ^{+}$ and strong mono base gives one mole of $OH ^{-}$ which form one mole of water.

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