Degree of ionisation of $1 M H C O O H$ is decreased to a maximum extent in the presence of:

1 M H C H O

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1 M N a O H

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1 M H C O O N a

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all of the above

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Solution

The correct option is C $1 M H C O O N a$
As $H C O O N a$ is a salt of weak acid which on dissolving in water will produce counter anion. i.e $H C O O^{-}$ which suppress the dissociation of $H C O O H$ due to common ion effect, hence, the degree of ionisation will be decreased to maximum extent.

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