2 Points
Which of the following is an example of a physical change?

An example of a physical change is the process of tempering steel to form a knife blade.

Explanation:

A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to maintain a sharp edge.

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