JEE Main · 2019 · Shift-IIeasyEC-112

Which one of the following graphs between molar conductivity (m) versus C is correct?

Electrochemistry · Class 12 · JEE Main Previous Year Question

Question

Which one of the following graphs between molar conductivity (Λm\Lambda_m) versus C\sqrt{C} is correct?

Options
  1. a

    image

  2. b

    image

  3. c

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  4. d

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Correct Answera

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Detailed Solution

Strategy: The relationship for strong electrolytes is linear (Λm=Λm0AC\Lambda_m = \Lambda_m^0 - A\sqrt{C}), while for weak electrolytes it is non-linear and steep at low concentrations.

Graph Comparison:

  • A correct graph must show a linear line with a negative slope for strong electrolytes (e.g., \ceKCl\ce{KCl}).
  • It must also show a curved, steep upward trend near the y-axis for weak electrolytes (e.g., \ceCH3COOH\ce{CH3COOH}).
  • Option (a) typically displays these two trends simultaneously and accurately.

Answer: (a)\boxed{\text{Answer: (a)}}

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