Question

Heat of neutralisation of a strong acid by a strong base has constant value because:

• A. salt formed does not undergo hydrolysis
• B. only $H^{+}$ and $O{H}^{-}$ ions react in every case
• C. strong acid and strong base react completely
• D. strong acid and strong base react in aqueous solutions only

Answer 1

The correct option is B only $H^{+}$ and $O{H}^{-}$ ions react in every case

Strong acid $\to H^{+}$

Strong base $\to O{H}^{-}$

$H^{+}+O{H}^{-}\to H_{2}O;\Delta H$

The reaction is the same for all strong acids and strong bases.

$\therefore \Delta H$ has a constant value.