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Degree of ionisation of 1 M HCOOH is decreased to a maximum extent in presence of: (A) 1 M HCHO (B) 1 M NaOH (C) 1 MHCOONa (D) equally in all

Degree of ionisation of 1 M HCOOH is decreased to a maximum extent in presence of:
(A) 1 M HCHO
(B) 1 M NaOH
(C) 1 MHCOONa
(D) equally in all

Grade:12

2 Answers

Arun
25750 Points
6 years ago
Degree of ionisation of 1 M HCOOH should be decreases,
If it reacts with a base.
Now 
HCOOH is an acid while NaOH is a base.
Hence correct option should be 'B'
Souvik Mukherjee
50 Points
6 years ago
Correct answer will be option C i.e. HCOONa, because being a salt it will completely dissociate and form ample amount of H+ ions which will decrease the dissociation of HCOOH via common ion effect by shifting the HCOOH dissociation equilibrium in backward direction.

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