After mg ribbon is reacted completely with air, the reason to add some water and heat is to convert the mg3n2 to mg(oh)2 convert the mg3n2 to mgo get the constant weight of the crucible, lid, and mgo make the mgo

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.