Question

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 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
• B. 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 1

Answer: (B)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Answer 2

Enthalpy of neutralisation of a strong acid (SA) and strong base (SB) is always −57 kJ/mol because a strong monoacid gives one mole of H+ and a strong mono-base gives one mole of OH−, which combine to form one mole of water. Both the assertion and reason are true, and (R) correctly explains (A).