CUET · CHEMISTRY · PYQ PAPER 2025
The limiting molar conductivities for \(\mathrm{H}^{+}, \mathrm{Na}^{+}, \mathrm{Cl}^{-}, \mathrm{CH}_3 \mathrm{COO}^{-}\)are \(349.6,50.1,76.3,40.9 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\), respectively, in water at 298 K.
Match List-l and List-II
| List-I | List-II |
| Electrolyte | \(\Lambda_m^o\) |
| (A) HCl | (I) \(390.5 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\) |
| (B) NaCl | (II) \(126.4 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\) |
| (C) \(\mathrm{CH}_3 \mathrm{COONa}\) | (III) \(425.9 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\) |
| (D) \(\mathrm{CH}_3 \mathrm{COOH}\) | (IV) \(91.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\) |
Choose the correct answer from the options given below:
- A (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
- B (A) - (III), (B) - (II), (C) - (I), (D) - (IV)
- C (A) - (IV), (B) - (II), (C) - (III), (D) - (1)
- D (A) - (III), (B) - (II), (C) - (IV), (D) - (1)
Answer & Solution
Correct Answer
(D) (A) - (III), (B) - (II), (C) - (IV), (D) - (1)
Step-by-step Solution
Detailed explanation
\(\Lambda_m^o (\mathrm{HCl}) = \Lambda_m^o (\mathrm{H}^{+}) + \Lambda_m^o (\mathrm{Cl}^{-})\) \(= 349.6 + 76.3 = 425.9 \, \mathrm{S} \, \mathrm{cm}^2 \, \mathrm{mol}^{-1}\). (A) - (III)…
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