Answer : The correct option is, 112 ml
Solution : Given,
Mass of
= 0.640 g
Molar mass of
= 64 g/mole
First we have to calculate the moles of
.

Now we have to calculate the moles of oxygen gas.
The balanced chemical reaction will be,

From the reaction, we conclude that
As, 2 moles of
react with 1 mole of
gas
So, 0.01 moles of
react with
mole of
gas
Now we have to calculate the volume of oxygen gas.
As, 1 mole of oxygen gas contains 22400 ml volume of oxygen gas
So,
mole of oxygen gas contains
volume of oxygen gas
Therefore, the volume of oxygen gas is, 112 ml