Question

A metal compound $X$, which is insoluble in water, reacts with dil. $H_2{SO}_4$ to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compounds formed is calcium sulphate, then what are $X$ and the gas evolved? Also, write a balanced chemical equation for the reaction which occurred.

Answer 1

Given, that the metal compound $X$ reacts with dil. $H_2{SO}_4$ it produces effervescence and the gas evolved extinguishes a burning candle.

Now, since the gas evolved extinguishes the candle it must be carbon dioxide. It is also given that one of the compounds formed is calcium sulphate, hence the metal compound $X$ is calcium carbonate.

Hence, the reaction between calcium carbonate and dil. $H_2{SO}_4$ is as follows:

$Ca{CO}_3+H_2{SO}_4\to Ca{SO}_4+{CO}_2+H_{2}O$