Question 14 Marks
If $\mathrm{A}_{2} \mathrm{~B}$ is $30 \%$ ionised in an aqueous solution, then the value of van't Hoff factor (i) is __________________ $\times 10^{-1}$.
Answer
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Sol.
$\mathrm{A}_{2} \mathrm{~B} \rightarrow 2 \mathrm{~A}^{+}+\mathrm{B}^{-2} ; \mathrm{y}=3$
$\alpha=0.3$
$\mathrm{i}=1+(\mathrm{y}-1) \alpha$
$=1+(3-1)(0.3)=1.6=16 \times 10^{-1}$
Sol.
$\mathrm{A}_{2} \mathrm{~B} \rightarrow 2 \mathrm{~A}^{+}+\mathrm{B}^{-2} ; \mathrm{y}=3$
$\alpha=0.3$
$\mathrm{i}=1+(\mathrm{y}-1) \alpha$
$=1+(3-1)(0.3)=1.6=16 \times 10^{-1}$
