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Grade 12Physical Chemistry

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

Profile image of Harish
8 Years agoGrade 12
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2 Answers

Profile image of Arun
8 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'
Profile image of Souvik Mukherjee
ApprovedApproved Tutor Answer8 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.