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Compare the reaction of the gas collected from Ca-HCl reaction with the reaction of hydrogen collected...

Compare the reaction of the gas collected from Ca-HCl reaction with the reaction of hydrogen collected from Zn-HCl reaction when each is brought near a flame.
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The reaction between Calcium and HCl is highly exothermic and the heat is sufficient to ignite the hydrogen gas liberated. Thus this will lead to an explosion.

Zinc reacts with HCl to give bubbles of Hydrogen gas. This gas when collected and brought near a flame goes off with a popping sound.

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