Question

.A substance X, which is an oxide of a group 2 element, is used intensively in the
cement industry. This element is present in bones also. On treatment with water, it
forms a solution which turns red litmus blue. Identify X and also write the chemical
reactions involved.

Answer 1

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The given substance X is calcium oxide. Calcium

oxide is used intensively in the cement industry. The element present in it (which is present in bones also) is calcium. Calcium oxide on treatment with water forms a solution of calcium hydroxide [Ca(OH)2] which is an alkali. Hence, it turns red litmus blue.

Answer 2

Answer:

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The element is Calcium and the substance X is Calcium Oxide (Cao). Calcium oxide is used extensively in the cement industry and Calcium is present in our bones in the form of Calcium Phosphate.