Answer:
Option B, [tex]75[/tex] %
Explanation:
The percentage yield can be defined as the recovery of fraction of reactant as product in any reaction.
Here in this question -
Number of moles of hydrogen reacting [tex]= 4[/tex]
Number of moles of hydrogen recovered as final product [tex]= 3[/tex]
Hence the percentage yield would be
[tex]\frac{3}{4} * 100\\= 75[/tex]
Yield is [tex]75[/tex] %
Hence, option B is correct