JEE MAIN - Chemistry (2025 - 24th January Evening Shift - No. 11)
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?
50 mL HCl and 20 mL NaOH
30 mL HCl and 30 mL NaOH
$45 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH}$ and 25 mL NaOH
$30 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH}$ and 30 mL NaOH
Explanation
Higher the number of milli moles of acid or base reacted higher will be temperature rise.
Option (4) $n_{\text {acid }}$ or $n_{\text {base }}$ reacted $=30 \mathrm{~m} \mathrm{~mol}$
Option (2) $n_{\text {acid }}$ or $n_{\text {base }}$ reacted $=30 \mathrm{~m} \mathrm{~mol}$
but less energy will be released by neutralisation
reaction of weak acid hence option (2) can not be correct.
Option (3) $\Rightarrow 20 \mathrm{~m} \mathrm{~mol}$
Option (4) $\Rightarrow 25 \mathrm{~m} \mathrm{~mol}$
Hence Correct Option (1)
Comments (0)
