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Question

Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?

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Solution

Carbon dioxide (CO2) gas is evolved during the reaction. We pass this gas through lime water it turns milky because of the CO2 passing through it. If we keep on passing the gas through the milky lime water, it would become clear again.

Ca(OH)2lime water+CO2CaCO3+H2O

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