3h2(g)+n2(g)→2nh3(g) If H2 is removed to the reaction above it will shift .
Left
RIght

Mgo2 is the oxidation state of manganese oxide

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.