Experiment to produce hydrogen gas by taking zinc pieces and concentrated HCl in a test tube .
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When dilute hydrochloric acid is added to granulated zinc placed in a test tube , the observation made is a colorless and odourless gas evolving with bubbles
Zinc reacts with dil HCl to form Zinc Chloride and Hydrogen gas is evolved. Hydrogen is colorless and odourless gas
Zn+2HCl→ZnCl2+H2
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