Give the information conveyed by the following information:
Zn + 2HCl $\to$ ZnCl₂ + H₂

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Solution

Zn (s) + 2HCl (g) $\to$ ZnCl₂ (s) + H₂ (g)
The above reaction conveyed the following informations:
It is a single displacement reaction where a non-metal hydrogen is displaced by a metal zinc.
Zinc (Zn) is a reductant metal which displaces H₂ from aqueous solution of HCl and gives Zinc chloride (ZnCl₂) and hydrogen (H₂) gas.
One atom of zinc reacts with two molecules of hydrochloric acid to give one molecule of zinc chloride and one molecule of hydrogen.
One mole of zinc reacts with two moles of hydrochloric acid to give one mole of zinc chloride and 22.4 litres of hydrogen at S.T.P.

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