Assertion : $M g O$ has a high melting point
Reason: Highly charged ions result in high bond strength

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Option $(A)$ is correct.
$M g O$ has a high melting point because highly charged ions result in high bond strength. The difference in electronegativity of the two elements, magnesium and oxygen, is extremely high. In other words, the very negatively charged oxygen and the very positively charged magnesium atoms will strongly attract each other. This tends to hold them in place against the tendency of heat to break them apart, hence a high temperature is needed to break this compound.

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Assertion :MgO has a high melting point Reason: Highly charged ions result in high bond strength

Assertion : $M g O$ has a high melting point
Reason: Highly charged ions result in high bond strength