Question

Differences between isomorphism and polymorphism plz

Answer 1

Isomerism: iso means equal and morphe means shape. the crystals which have same compositions but different crystalline form. 
ex:calcite and aragonite. these are 2 different minerals. they both are calcium carbonate minerals but they have different crystalline structures.
polymorphism: poly means many. the elements or substances which exist in more than one form are said to exhibit polymorphism.  
ex: carbon exists as  diamond,graphite,fullerene etc.