Zinc oxide, white in colour at room temperature, acquires yellow colour on heating due to:

Options

A. Zn being a transition element
B. paramagnetic nature of the compound
C. trapping of electrons at the site vacated by oxide ions
D. Both (A) & (B)

Answer

C

Explanation

Some of `O^(2-)` combine with each other forming `O_(2)` gas which is liberated leaving behind electrons at the site vacated by oxide ions