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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Knowledge Check

Which of the following compounds has the highest boiling point?

A

`CH_3CH_2CH_2Cl`

B

`CH_3CH_2CH_2CH_2Cl`

C

`CH_3CH(CH_3)CH_2Cl`

D

`(CH_3)_3C Cl`

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