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Question

Which of the following statements is/are true for BaO and MgO ?

A
BaO is more ionic than MgO
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B
MgO is more ionic than BaO
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C
BaO has a higher melting point than MgO
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D
MgO has a higher melting point than BaO
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Solution

The correct options are
A BaO is more ionic than MgO
D MgO has a higher melting point than BaO
Electronegativity of Ba is lower than Mg, so BaO is more ionic.
Mg has a much smaller radius than Ba , so MgO will have a higher melting point than BaO.
M.P.MgO>BaO
Ionic character αΔEN

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