Medium
$A$ 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 write the chemical reactions involved.
- ACalcium oxide $(CaO)$
- BCalcium carbonate $(CaCO_3)$
- CCalcium hydroxide $(Ca(OH)_2)$
- DCalcium chloride $(CaCl_2)$
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