Question

Select the explanation for what happens to copper in photochromic lenses from a redox perspective.

1) When photochromic lenses are removed from light, the copper is oxidized from +1 to +2.
2) When photochromic lenses are removed from light, the copper is oxidized from -1 to +1.
3) When photochromic lenses are removed from light, the copper is reduced from +1 to -2.
4) When photochromic lenses are removed from light, the copper is oxidized from +1 to +3.

Answer 1

When photochromic lenses are removed from light, the copper is oxidized from +1 to +2.

Step-by-step explanation:

The correct explanation for what happens to copper in photochromic lenses from a redox perspective is that when photochromic lenses are removed from light, the copper is oxidized from +1 to +2. This means that the copper atoms lose electrons and their oxidation state increases. This oxidation process is responsible for the color change in the lenses.