“1m of MgCl₂” and 2m of urea, aqueous solutions are found to boil at same temperature. Hence we can say

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Both solutions have same vapour pressure

MgCl₂ is 50% ionised

Both solutions freeze at same temperature

MgCl₂ is 66.6% ionised

answer is A, C, D.

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Detailed Solution

$\begin{array}{l} i_{1} {Kbm}_{1} = i_{2} {Kbm}_{2} \\ (1 + 2 α) \times 1 = 1 \times 2 \Rightarrow 1 + 2 α = 2 \\ \Rightarrow α = 0 .5 \Rightarrow 50 % \end{array}$

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