X is an ionic compound containing only magnesium, aluminium and oxygen. Which of the following can be the formula of X?

${M g}_{4} A l O_{2}$

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${M g}_{2} A l O_{4}$

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$M g A l O_{4}$

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$M g {A l}_{2} O_{4}$

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Solution

The correct option is D
$M g {A l}_{2} O_{4}$

Net charge on an ionic compound is always zero.

Mg has a charge of 2+, Al has 3+ and O has 2-

Let's look at the options and calculate the net charge. Among the given options, $M g {A l}_{2} O_{4}$ is the best answer.

Because its net charge is 0 -> (1)(+2) + 2(+3) + 4(-2) = 0.

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X is an ionic compound containing only magnesium, aluminium and oxygen. Which of the following can be the formula of X?

The correct option is D MgAl2O4 Net charge on an ionic compound is always zero. Mg has a charge of 2+, Al has 3+ and O has 2- Let's look at the options and calculate the net charge. Among the given options, MgAl2O4 is the best answer. Because its net charge is 0 -> (1)(+2) + 2(+3) + 4(-2) = 0.