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Q.

Elevation in boiling point of decimolal aqueous solution of K4[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

ΔTb=Kb.m.i  for K4Fe(CN)6ΔTb=Kb⋅0.1×3
For urea
ΔTb=Kb×0.1×1
For Na3PO4
ΔTb=kb×1×4
For MgCl2
ΔTb=kb×0.1×3

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