NEETChemistryThermodynamics (C)
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Enthalpy of neutralization of reaction. ( HF + NaOH NaF + H ₂ O is -16.7 Kcal / eq. ) Reason (R) : HF is a strong acid so, its enthalpy of neutralization increases with strong base. In the light of the above statements choose the most appropriate answer from the options given below
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A).
- B(A) is correct but (R) is not correct.
- C(A) is not correct but (R) is correct.
- DBoth (A) and (R) are correct and (R) is the correct explanation of (A).
Correct answer
B. (A) is correct but (R) is not correct.
Step-by-step solution
- Assertion (A): The enthalpy of neutralization for the reaction ( HF + NaOH NaF + H ₂ O ) is indeed approximately (-16.7 kcal / eq ). This value indicates that the reaction is exothermic, which is correct. - Reason (R): HF is a weak acid, not a strong acid. Therefore, the assertion that the enthalpy of neutralization increases with a strong base when a strong acid is involved is misleading. The enthalpy of neutralization for weak acids tends to be less negative compared to strong acids. Hence, while the assertion