Question

Equal volume of 1 $MHCl$ and 1 $M{H}_{2}S{O}_4$ are neutralized by dilute NaOH solution and $x$ and $y$ kcal of heat are liberated respectively. Which of the following is true?

• A. $x=y$
• B. $x=0.5y$
• C. $x=0.4y$
• D. None of the above

Answer 1

The correct option is B $x=0.5y$

$1M{H}_{2}S{O}_4=2eq.H_{2}S{O}_4$
$1MHCl=1eq.HCl$
Thus, for equal volume of two acids to be neutralized separately with NaOH, heat evolved will be twice in case of $H_{2}S{O}_4$ to that of $HCl$.
Hence, $x=0.5y$.