Question

A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube.Identify the evolved gas. Gas was then passed through lime water. What change would be observed in lime water. Is this type of reaction endothermic or exothermic.?

Answer 1

Explanation:

Answer: Marble is Calcium Carbonate (CaCO3) Calcium carbonate when added to HCl gives Calcium Chloride, Water and Carbon Dioxide. CaCO3 + HCl --> CaCl2 + H2O + CO2 When this gas (which is CO2) is passed through lime water, Lime water turns milky due to the formation of CaCO3 and H20

Answer 2

Answer:

it is exothermic reaction.

carbon dioxide gas is evolved. when it is passed through lime water, the lime water turns milky

Explanation:

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