Sodium is an element having oxidation number of ………….in free state
a) +1
b) zero
c) +2
d) -1
The oxidation number of an ion is equal to … present on it.
a) zero
b) +1
c) charge
d) +2
Al+3 has an oxidation number of ……….
a) -1
b) +2
c) zero
d) +3
The oxidation number of hydrogen is usually
a) +3
b) -1
c) +2
d) +1
Oxidation number of hydrogen in metal hydrides is ………
a) +1
b) 0
c) +2
d) -1
In NaH, the oxidation number of hydrogen is
a) -1
b) 0
c) +2
d) -2
