Question

The decreasing order of electrical conductivity of the following aqueous solutions is:

1. 0.1 M Formic acid,
2. 0.1 M Acetic acid,
3. 0.1 M Benzoic acid.

Options

• A > C > B

• C > B > A

• A > B > C

• C > A > B

Answer 1

A > C > B

Explanation:

Order of acidic strength is:

\[\ce{HCOOH > C6H5COOH > CH3COOH}\]

More the acidic strength, more will be the dissociation of acid into ions and more will be the conductivity.

Thus, the order of conductivity will be,

\[\ce{\underset{(A)}{HCOOH} \underset{>}{>} \underset{(C)}{C6H5COOH} \underset{>}{>} \underset{(B)}{CH3COOH}}\]