Write on metal excess defect.

(A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal excess defect due to anionic vacancies

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

Crystal defects give some important properties to solids. The defects are due to either metal excess of metal defficiency of doping Colour Causing F-Center is created when ----

Crystal defects give some important properties to solids. The defects are due to either metal excess of metal defficiency of doping ZnO an strong heating becomes yellow due to

In alpha crystal with metal deficiency defect …………..

Consider following statements I: If three Fe^(2+) are missing from its lattice site in FeO , then there must be two Fe^(3+) ions somewhere in the lattice to balance the electrical charges II : Crystals with metal deficiency defects are called super-conductors III: Crystals with metal deficiency defects are called semiconductors The correct statements are

Write the deficiency defects of vitamins B_(1), B_(2), B_(6) and B_(12)

Write two examples of metals reacting with nitric acid

Write the process of extraction of metals belongs to : moderately reactive series