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Student added zinc granules to dilute hydrochloric acid. Then what is the conclusion of the reaction.

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Student feel hot when he touched bottom of the beaker and concluded reaction as exothermic reaction.

Zinc displaces hydrogen from hydrochloric acid and concluded the reaction has chemical displacement reaction.

The gas liberated put off the burning match stick with pop sound and hence the concluded liberation of hydrogen gas

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Detailed Solution

The gas liberated put off the burning match stick with pop sound and hence the concluded liberation of hydrogen gas. $Zn + 2 HCl \to {ZnCl}_{2} + H_{2} ↑$

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