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JEE Main202524 Jan 2025Evening ShiftChemistryThermodynamics (C)Actual

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

Options

  1. A30 ~mL CH ₃ COOH and 30 mL NaOH
  2. B45 mL 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 + H ₂ O mmol 30 30 Final volume of solution =60 ~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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