Question

# ASSERTION: The heat of neutralisation of perchloric acid,$HCl{{O}_{4}}$ with NaOH is the same as that of HCl with NaOH.REASON: Both HCl and $HCl{{O}_{4}}$ are strong acids.A. Both assertion and reason are correct and reason is the correct explanation of assertion.B. Both assertion and reason are correct but reason is not the correct explanation of assertion.C. Assertion is correct but reason is incorrect.D. Both assertion and reason are incorrect.

In our question , we have been given two acids, HCl and $HCl{{O}_{4}}$. Both are strong acids, and as well as NaOH is a strong base. So, they will undergo complete dissociation. As strong bases and strong acids react to form neutral salt and water, the reactions in both the cases are same i.e,
${{H}^{+}}+O{{H}^{-}}->{{H}_{2}}O+salt$
In case there was a strong acid and a weaker acid, then the ${{H}^{+}}$ ion would only have been given by the stronger acid. Same is the case for $O{{H}^{-}}$ions for a stronger/weaker base. In that case, we would have obtained different values of heat of neutralisation.