Question

The equivalent weight of oxygen, when it is converted to oxide is equal to
(1) M.Wt/3
(2) M.Wt
(3) M.Wt/4
(4) M.Wt/2

Actually the Ans. is option (3)..but i need explaination and solution.​

Answer 1

Oxygen has two positive charge but when we talk about it's oxide that is O2 the it will have 4 positive charges

O2 = Molecular weight /n factor

Answer 2

Answer: $\frac{\text{Molecular weight}}{4}$

Explanation:

Equivalent weight is calculated by dividing the molecular weight by n factor.  

${\text{Equivalent weight}}=\frac{\text{Molecular weight}}{n}$

where n = acidity ,for bases  

n= basicity, for acids

n= valency, for elements

n= cationic charge , for compounds

${\text{Equivalent weight}}=\frac{\text{Molecular weight}}{Valency}$

Oxygen molecule gains four electrons to convert into its oxide ion.Each oxygen atom accepts two electrons to complete its octet.

$O_2+4e^{-1}\rightarrow 2O^{2-}$

${\text{Equivalent weight}}=\frac{\text{Molecular weight}}{4}$

Thus The equivalent weight of oxygen, when it is converted to oxide is equal to $\frac{\text{Molecular weight}}{4}$