Give chemical name and nature (acidic or basic) of the ash formed by burning of a $M g$ ribbon in the air?

magnesium chloride, acidic

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magnesium nitrite, basic

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magnesium oxide, acidic

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magnesium oxide, basic

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Solution

The correct option is D magnesium oxide, basic
Option $(D)$ is correct.
Magnesium oxide is formed as ash by burning of $M g$ ribbon in the air. This is an exothermic reaction.
$2 M g + O_{2} \to 2 M g O + e n e r g y$
Magnesium oxide is basic in nature as it reacts with water to form magnesium hydroxide which is a base.

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What is the nature (acidic /basic) of the following oxides ?

(a) Magnesium oxide (b) Sulphur dioxide

Give reason for your choice.

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