Which one of the following solutions has lowest conducting power?

0.1 M C H_{3} C O O H

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0.1 M N a C l

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0.1 M K N O_{3}

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0.1 M H C l

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Solution

The correct option is A $0.1 M C H_{3} C O O H$
The concentration of all the solutions is same.

$C H_{3} C O O H$ is a weak electrolyte. Its degree of dissociation is very low. Whereas $K N O_{3}$ , $N a C l$ and $H C l$ are strong electrolytes. They are completely dissociated into ions in aqueous solution.

Hence, the conducting power is lowest for $0.1 M C H_{3} C O O H$

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p O H = p K_{b} (N H_{3})

K C l

p H = p K a

(1) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M C H_{3} C O O N a

(2) 100 m l

0.1 M C H_{3} C O O H + 50 m l

0.1 M N a O H

(3) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M N a O H

(4) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M N H_{3}

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