Q.

Degree of ionisation of 1 M HCOOH is decreased to a maximum extent in the presence of

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a

1 M HCHO

b

I M NaOH

c

1 M HCOONa

d

All of these

answer is C.

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Detailed Solution

As HCOONa is a salt of weak acid which on dissolving in water will produce counter anion. i.e HCOO− which suppress the dissociation of HCOOH due to common ion effect, hence, the degree of ionisation will be decreased to maximum extent.
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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