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$\text{K}_2\text{HgI}_4$ is 40% ionised in aqueous solution. The value of its van’t Hoff factor (i) is:
(1). (1.6)
(2). (1.8)
(3). (2.0)
(4). (2.2)
$\text{K}_2\text{HgI}_4 \rightleftharpoons 2\text{K}^+ + [\text{HgI}_4]^{2-}$; $n = 3$. $\alpha = (i-1)/(n-1)$; $0.4 = (i-1)/2$. $i = 1.8$.
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