Chemical Bonding! (2)
Chemistry
Level
3
Which Cation of Group 12 has highest polarising power?
Zn+2
None of these options
Cd+2
Hg+2
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1 solution
From the fundamental concepts Polarising power is inversely proportional to size of cation. (After charge of course)
So the answer should be Zn+2 but it was experimentally Observed that Polarising power increases down the group which can also be seen using the colors of sulphides of group 12 .
As we know more is polarising power more will be intensity of color
ZnS Is white , CdS Is yellow while HgS Is black which shows that Hg+2 has more polarising power
It can also be explained on the basis of higher effective Nuclear Charge