List of practice Questions

Arrange the following oxoacids of phosphorus in the correct decreasing order of their reducing strength.
A. H₄P₂O6
B. H₃PO₂
C. H₄P₂O₇
D. H₃PO₃
Choose the correct answer from the options given below :

Zinc oxide is white in colour at room temperature. It appears yellow on heating because of :