Rashi was performing an experiment. She mixed a compound X with water in a beaker. She found that the beaker was becoming hot, releasing heat and forming a new substance Y. She was shocked and left the room leaving the product. After three-four days when she returned, she found that the substance Y has changed into a shiny substance Z. What are X, Y and Z.

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Solution

The correct option is D
Calcium oxide (X) reacts with water exothermically to produce calcium hydroxide (Y). Calcium hydroxide when exposed to air reacts with the carbon dioxide present in the air forming calcium carbonate (Z). The formation of calcium carbonate is what causes the shiny finish to appear.

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