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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a
Hg(NO3)2 is fully ionised but HgCl2 is fully unionised
b
Hg(NO3)2 and HgCl2 both are completely ionised
c
Hg(NO3)2 is fully unionised but HgCl2 is fully ionised