P block elements related problem
Chemistry
Level
2
Which is the most stable ionic chloride?
A.PbCl2
D.CCl4
B.PbCl4
C.SiCl4
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1 solution
CCl4 and SiCl4 are covalent... So they can't be the right answer Now coming to PbCl2 and PbCl4... PbCl2 is more stable. This is due to inert pair effect. Pb has four electrons in its outermost shell, two are in s orbital and two in the p orbital. Due to d-block contraction{ or we can say, poor shielding effect of d and f orbital} the s orbital electrons are more strongly held than s electrons in upper periods in the same group. The s electrons are inert and are not that easily removed to give the group valency of 4. Therefore, Pb tends to form 2+ ion instead of expected 4+ ion.