The oxidation number of Ca in Ca+2 is
-1
-2
+1
+2
In a single monoatomic ion, the oxidation number of the atom is same as the charge on the ion.
The oxidation numbers of C - 1 and C - 2 in propene CH32CH=1CH2 are respectively
Let a, b and c be real numbers such that a+ 2b + c = 4 then the maximum value of ab + bc + ca is