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JEE Main 202524 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
24 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Main 2025 · 24 January · Evening Shift · Chemistry · Thermodynamics (C)

Which of the following mixing of 1 M base and 1 M acid leads to the...

Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?

Options

  1. A30 mLCH3COOH30 \mathrm{~mL} \mathrm{CH}_3 \mathrm{COOH} and 30 mL NaOH
  2. B45 mL CH3\mathrm{CH}_3 COOH and 25 mL NaOH
  3. C30 mL HCl and 30 mL NaOH
  4. D50 mL HCl and 20 mL NaOH

Correct answer

C. 30 mL HCl and 30 mL NaOH

Step-by-step solution

The rise in temperature of neutralization reaction will be maximum for maximum number of moles of strong acid and strong base neutralized and lower volume of final solution. (3) HCl+NaOH→NaCl+H2O\mathrm{HCl}+\mathrm{NaOH} \rightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O} mmol 303030 \quad 30 Final volume of solution =60 mL=60 \mathrm{~mL} Option (1) and (2) have weak acids and in option (4) only 20 mmol of HCl will be neutralized with 70 mL final volume.
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