Given below are two statements: One is labelled as Assertion (A) …

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 $-57 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Reason ($R$): Enthalpy of neutralisation is the amount of heat liberated when one mole of $\mathrm{H}^{+}$ions furnished by acid combine with one mole of ${ }^{-} \mathrm{OH}$ 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 $-57 \mathrm{~kJ} / \mathrm{mol}$ because strong monoacid gives one mole of $\mathrm{H}^{+}$and strong mono base gives one mole of $\mathrm{OH}^{-}$which form one mole of water.