What happens when magnesium oxide is dissolved in water?

Magnesium is formed

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Magnesium hydroxide is formed

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Magnesium dioxide is formed

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Magnesium carbonate is formed

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Solution

The correct option is B
Magnesium hydroxide is formed

When magnesium oxide is dissolved in water, magnesium hydroxide is formed. So, the reaction between magnesium oxide and water is a chemical change, as a new substance(magnesium hydroxide) is formed.

$M g O + H_{2} O \to M g (O H)_{2}$

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Carbon dioxide, dissolved in water, can dissolve rocks containing calcium carbonate and magnesium carbonate. What are the respective salts formed?

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