Zinc oxide (white) is heated to high temperature for some time. Observe the following statement regarding above process I. Zinc oxide colour changes to pale yellow II. The type of defect formed is 'metal deficiency' III. Some Zn ²⁺ and e⁻ are present in interstitial places The correct statements are

Step-by-step solution

Zinc oxide is white in colour at room temperature on heating it loses oxygen and turns yellow. ZnO heating Zn ²⁺+ 1 2 O ₂+2 e ⁻ The excess Zn ²⁺ ions more to interstitial site and electrons to neighbouring interstitial site. It is metal excess defect due to the pressure of extra cations at interstitial sites. So, (i) and (iii) are correct.