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Electrochemistry question

2019 · 10 Apr · Shift 2 · Q3
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Electrochemistry question

2019 · 10 Apr · Shift 2 · Q3

JEE MainChemistryElectrochemistryMCQ+4 / −1
Which one of the following graphs between molar conductivity (Λm{\Lambda _m}Λm​) versus C\sqrt CC​ is correct ?
  1. A
    JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 144 English Option 1
  2. B
    JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 144 English Option 2
  3. C
    JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 144 English Option 3
  4. D
    JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 144 English Option 4
View written solutionFree

Correct answer: A

  1. For electrolytes, the variation of molar conductivity Λm\Lambda_mΛm​ with concentration is understood using Kohlrausch-type behavior.

  2. Since the graph is asked between Λm\Lambda_mΛm​ and C\sqrt{C}C​:

    • As concentration CCC increases, interionic interactions increase.
    • Therefore molar conductivity Λm\Lambda_mΛm​ decreases.
    • At C→0C \to 0C→0, Λm→Λm∘\Lambda_m \to \Lambda_m^\circΛm​→Λm∘​ (limiting molar conductivity).

  3. For a strong electrolyte, the relation is approximately Λm=Λm∘−KC\Lambda_m = \Lambda_m^\circ - K\sqrt{C}Λm​=Λm∘​−KC​ where KKK is a constant.

  4. This equation represents a straight line with:

    • intercept Λm∘\Lambda_m^\circΛm∘​ at C=0\sqrt{C}=0C​=0
    • negative slope

  5. Hence the correct graph must be a straight line decreasing linearly with C\sqrt{C}C​.

  6. Among the given options, this corresponds to Option A.

Therefore, the correct answer is: A\boxed{A}A​

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