Assertion (A): Zinc oxide is colourless at room temperature but on heating it becomes yellow in colour.
Reason (R): On heating Zinc loses oxygen and thereby forming free zn2+ ions. The excess zn ions move to interstitial sites and the electrons also occupy interstitial positions.
(a) Both A and R are correct and R is the correct explanation of A
(b) Both A and R are correct R is not the correct explanation of A
(c) A is correct but R is wrong.
(d) A is wrong but R is correct
