(A) Polymorphism refers to the ability of a solid material to exist in more than one form or crystal structure. $NaF$ and $MgO$ both crystallize in th

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$NaF$ and $MgO$ are polymorphous compounds.

(A) Polymorphism refers to the ability of a solid material to exist in more than one form or crystal structure. $NaF$ and $MgO$ both crystallize in the rock salt structure ($NaCl$ type) and do not exhibit polymorphism. Therefore,the statement that $NaF$ and $MgO$ are polymorphous compounds is incorrect.

Class 12 Chemistry Solid State Type of solid and Their properties

Medium

Which of the following statements is $NOT$ true about polymorphism?

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A
$NaF$ and $MgO$ are polymorphous compounds.
B
Fullerene is a polymorphic form of carbon.
C
Polymorphism occurring in elements is called allotropy.
D
$A$ single substance that exists in two or more forms is said to be polymorphous.