Explain the metal excess defects due to extra cation in the interstitial sites

The questions given below consist of an assertion and the reason. Use the following key to choose the appropriate answer. (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.(c) Assertion is is CORRECT but reason is INCORRECT. (d) If assertion is INCORRECT but reason is CORRECT. (e)If both assertion and reason are INCORRECT. Assertion: In ZnO the excess Zn^(2+) ions are present interstitial sites. REason: Metal excess crystals have either missing cation or anin in intertitial site.

What are metal deficiency defects ?

Explain the terms the magnetic field due to earth at a point.

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of suitable example.

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.