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Q.

Elevation in boiling point of decimolal aqueous solution of $K_{4} [Fe {(CN)}_{6}],$ Which is 50% ionized is equal to that of

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a

1 molal Na₃PO₄, Which is 100% ionised

b

0.1 molal MgCl₂ solution, which is 100% ionized

c

decimolal urea solution

d

Both 1 and 2

answer is B.

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Detailed Solution

$Δ T_{b} = K_{b} . m . i \begin{aligned} for K_{4} [Fe (CN)_{6}] \\ Δ T_{b} = K_{b} \cdot 0.1 \times 3 \end{aligned}$
For urea
$Δ T_{b} = K_{b} \times 0.1 \times 1$
For ${Na}_{3} {PO}_{4}$
$Δ T_{b} = k_{b} \times 1 \times 4$
For MgCl₂
$Δ T_{b} = k_{b} \times 0.1 \times 3$

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