The decreasing order of electrical conductivity of the following aqueous solutions is: (A) 0.1 M Formic acid, (B) 0.1 M…
Electrochemistry · Class 12 · JEE Main Previous Year Question
The decreasing order of electrical conductivity of the following aqueous solutions is:
(A) 0.1 M Formic acid, (B) 0.1 M A\cetic acid, (C) 0.1 M Benzoic acid.
- a
(A) > (B) > (C)
- b✓
(A) > (C) > (B)
- c
(C) > (B) > (A)
- d
(C) > (A) > (B)
(A) > (C) > (B)
Strategy: For weak acids of the same concentration, conductivity is proportional to the number of ions, which depends on the acid dissociation constant (). Higher \implies higher \degree of dissociation.
Comparison of Acid Strengths:
- Formic acid (A): The strongest among the three due to lack of bulky/donating groups. (Highest )
- Benzoic acid (C): Intermediate strength.
- A\cetic acid (B): Weakest among the three because the group is +I (inductive) and redu\ces acidity. (Lowest )
Order of conductivity: A > C > B.
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