3.24 g Hg(NO3)2 (Molecular mass 324) dissolved in 1000 g of water constitutes a solution having a freezing point −0.0558oC, while 21.68 g of HgCl2 (Molecular mass 271) in 2000 g of water constitutes a solution with a freezing point of −0.0744oC. The Kf of water is 1.86 K Kg mol-1. About the state of ionisation of the two solids in water can be inferred that.

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Hg(NO3)2 is fully ionised but HgCl2 is fully unionised

Hg(NO3)2 and HgCl2 both are completely ionised

Hg(NO3)2 is fully unionised but HgCl2 is fully ionised

Both Hg(NO3)2 and HgCl2 are completely unionised.

answer is A.

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Detailed Solution

0.0558=i×3.24324×1.86i=3 (100% ionised)0.0744=i×21.68271×1.86×10002000i=1 (unionised)

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