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Which of the following substance has the...

Which of the following substance has the highest melting point? .

A

NaCl

B

KCl

C

MgO

D

BaO

Text Solution

Verified by Experts

The correct Answer is:
C
Melting points depend upon lattice energy. Now NaCl and KCl have unit charge on their ions while MgO and BaO have two units of charge, therefore, lattice energies of MgO and BaO are expected to be larger than those of NaCl and KCl. Further since `Mg ^(2+)` is smaller than `Ba ^(2+),` therefore, MgO has the highest lattice energy and hence has the highest melting point.
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VMC MODULES ENGLISH-CHEMICAL BONDING & MOLECULAR STRUCTURE -SOLVED EXAMPLES
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  11. Which of the following is paramagnetic ?

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  12. Among LiCl, RbCl, BeCl2, MgCl2, the compounds with greatest and least ...

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  13. Which of the following molecular orbitals has two nodal planes ?

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