Simple Chem. Question (1 Viewer)

[McRafi9]

Please provide explanation along with the solution.

In which compound is the valency of lead NOT 2?

(A) PbO₂

(B) PbSO₄

(C) PbCl₂

(D) Pb(OH)₂

 

[jazz519]

Please provide explanation along with the solution.

In which compound is the valency of lead NOT 2?

(A) PbO₂

(B) PbSO₄

(C) PbCl₂

(D) Pb(OH)₂

For this question you have to use the oxidation state rules. So we know that a compound has an overall oxidation state of 0, while oxygen is -2 (unless in peroxide where it's -1 but none of these compounds are peroxides).

So for (a) there is two oxygens so the o2 is 4- but the overall compound has a 0 oxidation state so the lead must be 4+ (Answer is A)

(B) sulphate ion is 2- so lead is 2+

(C) one cl ion is 1- so two cl ions is 2-, thus lead is 2+ Since the overall charges added up need to equal 0 since it's a compound

(D) one oh ion is 1- so two oh ions is 2- so lead is 2+