The percentage dissociation of a salt ($\mathrm{MX}_{3}$) solution at given temperature (van't Hoff factor $\mathrm{i}=$ 2 ) is. ______ % (Nearest integer)

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Solutions

The percentage dissociation of a salt (

MX_{3}

) solution at given temperature (van't Hoff factor

i =

2 ) is. ______ % (Nearest integer)

Answer: 33

Solution

Dissociation of

M X_{3}

gives one

M^{3 +}

and three

X^{-}

, four particles from one formula unit. With

i = 1 + (n - 1) α

and

n = 4

, the relation becomes

2 = 1 + 3 α

, so

α = \frac{1}{3} = 0.333

. The percentage dissociation is 33%.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Integer answer

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