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Solution


Q.

The percentage dissociation of a salt (MX3) solution at given temperature (van’t Hoff factor i = 2) is ................. % (Nearest integer)            [2025]

Ans.

(33)

MX3→M3++3X- 

Van’t Hoff factor (i) is related to degree of dissociation (α) as:

i=1+(n-1)α 

Where n is the number of moles formed by complete dissociation of 1 mol of salt

2=1+(3-1)α 

α = 0.3333 

Percentage dissociation = 33.33% (nearest integer = 33)