Q.

HgCl2 and I2 both when dissolved in water containing I- ions, the pair of species formed is            [2017]
 

1 HgI2,I-  
2 HgI42-,I3-  
3 Hg2I2,I-  
4 HgI2,I3-  

Ans.

(2)

HgCl2 (aq)+4I(aq)- ⟶ HgI4(aq)2-+2Cl(aq)-

I2 (s)+I(aq)- ⟶ I3(aq)-