The following reaction KBr + Mg -->

a
will occur because Mg is more active than K
b
will not occur because Mg is more active than K
c
will occur because K is more active than Mg
d
will not occur because K is more active than Mg

Idon’t know how to solve this question

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

What type of reaction fuels the processes seen here?