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JEE Main 201911 JanuaryEvening Shift
Exam
JEE Main
Year
2019
Date
11 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Solutions

JEE Main 2019 · 11 January · Evening Shift · Chemistry · Solutions

K_ 2 HgI_ 4 is 40 \% ionised in aqueous solution. The value of its...

K2HgI4\mathrm{K}_{2} \mathrm{HgI}_{4} is 40%40 \% ionised in aqueous solution. The value of its van't Hoff factor (i) is:

Options

  1. A1.6
  2. B1.8
  3. C20
  4. D22

Correct answer

B. 1.8

Step-by-step solution

\mathrm{K}_{2} \mathrm{Hgl}_{4} \rightleftharpoons 2 \mathrm{~K}^{+}+\left[\mathrm{Hgl}_{4}\right]^{2-} ; \mathrm{n}=3 ∵α=i−1n−1;0.4=i−13−1i=1.8\begin{aligned} \because& \alpha=\frac{i-1}{n-1}; 0.4=\frac{\mathrm{i}-1}{3-1}\\ & i=1.8 \end{aligned}
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