Define the following with example, (i) Allotropy and allotropes, (ii)

1.	Define the following with example, (i) Allotropy and allotropes, (ii) polymorphism, (iii) isomorphism.
Answer» (i) The existence of an element in two or more chemically similar but physically different forms is called allotropy and the different forms are called allotropes, e.g., diamond, graphite, wood charcoal, lamp black etc., are allotropes of carbon. (ii) The existence of a compound in different crystalline forms is called polymorphism and the different forms are called polymorphs, e.g., ZnS has two polymorphs called zinc blende and wurtzite. (iii) The existence of different compounds with similar chemical composition in the same crystalline form is called [M₂SO₄M₂ (SO₄)₃ 24H₂O] are isomorphs.

Define the following with example, (i) Allotropy and allotropes, (ii) polymorphism, (iii) isomorphism.

Answer»

(i) The existence of an element in two or more chemically similar but physically different forms is called allotropy and the different forms are called allotropes, e.g., diamond, graphite, wood charcoal, lamp black etc., are allotropes of carbon.

(ii) The existence of a compound in different crystalline forms is called polymorphism and the different forms are called polymorphs, e.g., ZnS has two polymorphs called zinc blende and wurtzite.

(iii) The existence of different compounds with similar chemical composition in the same crystalline form is called [M₂SO₄M₂ (SO₄)₃ 24H₂O] are isomorphs.

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