Verified Solution • 2025–26 Session moderate

QJEEM25Chd333: JEE Main 2025 Chemistry - Class 11 JEEM25Chd333 Solution: Which of the following mixing of 1 M base and 1 M acid leads to …

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

Multiple Choice Options

  • A 50 mL HCl and 20 mL NaOH
  • B 30 mL HCl and 30 mL NaOH
  • C 45 mL CH3COOH45 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH} and 25 mL NaOH
  • D 30 mL CH3COOH30 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH} and 30 mL NaOH

Step-by-Step Verified Solution

Higher the number of milli moles of acid or base reacted higher will be temperature rise.

Option (4) nacid n_{\text {acid }} or nbase n_{\text {base }} reacted =30 m mol=30 \mathrm{~m} \mathrm{~mol}

Option (2) nacid n_{\text {acid }} or nbase n_{\text {base }} reacted =30 m mol=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) ⇒20 m mol\Rightarrow 20 \mathrm{~m} \mathrm{~mol}

Option (4) ⇒25 m mol\Rightarrow 25 \mathrm{~m} \mathrm{~mol}

Hence Correct Option (1)

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