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Grade 11Engineering Entrance Exams

1) Which one of the following has exceptionally high melting point?

a) MgO

b) NaCl

c) KCl

d) NaOH

Profile image of Radhika Batra
12 Years agoGrade 11
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1 Answer

Profile image of Amit Saxena
12 Years ago

Ans:     a

Exp:     Since coulombic forces of attraction vary directly as the product of charges, therefore, higher the charge on ions, greater is lattice energy and hence higher the melting point of ionic solid. Thus, lattice energy and hence the melting point of bi-bivalent ionic solid (mg2+, O2-) is greater than of uni-univalent ionic solid.


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