Question

Consider the reaction below.

2 upper K plus upper B r subscript 2 right arrow 2 upper K superscript plus, plus 2 upper B r superscript minus.

What is being reduced?
only K
only Br2
both K and Br2
neither K nor Br2

Answer 1

Only Br2.

Reason: K goes from 0 to +1 (oxidized, loses electrons). Br2 goes from 0 to -1 (reduced, gains electrons to form Br–).