.Find the valency of-
(i) Lead in PbO-
(ii) Iron in Fe2O3 -
(iii) Manganese in KMnO4
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(¡) its valency is 2. generally valency of an atom is equal to no electron in the last subshell.
(¡¡)In FeO , Fe has a valency of 2. In Fe2O3, Fe has a valency of 3.
(¡¡¡)The valency of Mn is +7.
In KMnO4, let the valency of Mn be ‘x’.
We know that the valency of O is -2 and that of K is +1.
The overall charge of the compound is zero.
(+1) + x + (-2)4=0x - 7 = 0x=+7
In general for a compound AxBy,
(Valency of A)x + (Valency of B)y = overall charge on the compound.
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