Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?

Correct answer: (B) x=y/2. Enthalpy of 1 ~g equivalent of strong acid and 1 ~g equivalent strong base =13.7 kcal Equal volume contains double eq. of H_2 SO_4 than HCl

Q20 / 160 · WBJEE 2009 · Chemistry

Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute $\mathrm{NaOH}$ solution and $\mathrm{x} \mathrm{kcal}$ and $\mathrm{y} \mathrm{kcal}$ of heat are liberated respectively. Which of the following is true?

A
$x=y$
Correct answer
B
$x=\frac{y}{2}$
C
$x=2 y$
D
none of the above

Solution

Enthalpy of $1 \mathrm{~g}$ equivalent of strong acid and $1 \mathrm{~g}$ equivalent strong base $=13.7 \mathrm{kcal}$ Equal volume contains double eq. of $\mathrm{H}_2 \mathrm{SO}_4$ than $\mathrm{HCl}$

Hence, the correct answer is option: 'B'.

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