73. For the reaction \( \mathrm{N}_{2}+3 \mathrm{H}_{2}=2 \mathrm{NH}_{3} \) in a vessel, afer the addition of equal number of moles of \( \mathrm{N}_{2} \) und \( \mathrm{H}_{2} \), equilibrium state is formed. Which of the following is correct?
A. \( \left[\mathrm{H}_{2}\right]=\left[\mathrm{N}_{2}\right] \)
B. \( \left[\mathrm{H}_{2}\right]>\left[\mathrm{N}_{2}\right] \)
C. \( \left[\mathrm{H}_{2}\right]<\left[\mathrm{N}_{2}\right] \)
D. \( \left[\mathrm{H}_{2}\right]<\left[\mathrm{NH}_{3}\right] \)