A substance $X$ which is an oxide of a group element is used intensively in the cement industry. This element is also present in bones. On treatment with water, it forms a solution which turns red litmus blue. What is $X$ ?

Magnesium oxide

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Calcium oxide

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Calcium hydroxide

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Magnesium hydroxide

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Solution

The correct option is C Calcium oxide
The element $X$ is calcium. In cement industry, it is used as gypsum. In bones, calcium is present to give hardness in the form of a hydroxyapetite complex. In the reaction of $C a$ with water, calcium hydroxide is formed which is an alkaline solution turning red litmus blue.

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A substance X which is an oxide of a group element is used intensively in the cement industry. This element is also present in bones. On treatment with water, it forms a solution which turns red litmus blue. What is X?

A substance $X$ which is an oxide of a group element is used intensively in the cement industry. This element is also present in bones. On treatment with water, it forms a solution which turns red litmus blue. What is $X$ ?