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Q.

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

d

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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