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Metals

A metal compo...

Question

A metal compound 'x' reacts with dilute H₂SO₄to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compound formed is calcium sulphate then what is 'x' and the gas evolved? Write the chemical equation for the reaction that occurred?

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Solution

The metal compound 'x' may be calcium carbonate (It cannot be calcium hydrogen carbonate because calcium hydrogen carbonate is found only in solution and it is too unstable to exist as a solid). When it reacts with dilute sulphuric acid , it results in the formation of calcium sulphate and carbon dioxide gas is liberated. The effervescence is seen due to evolution of carbon dioxide and carbon dioxide gas extinguishes the burning candle.

CaCO₃ (s) + H₂SO₄ (aq) $\to$ CaSO₄(aq) + H₂O(l) + CO₂ (g)

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