Question

Name the gas evolved when $HCl$ is added to Zinc metal.

Answer 1

Periodic table consists of metals, which can easily lose electrons and has the electropositive character useful for the purpose of reduction of chemical compounds. Zinc is a metal that reacts with acids to produce a gas with bubbles, the gas formed in this reaction is hydrogen gas.

Complete answer:
Chemical compounds are classified into three types based on the nature of those compounds, they are acids, bases and neutral compounds.
An acid is a substance that can donate a proton or accept hydroxide ions that have low pH values. Some of the examples of acids are hydrochloric acid, sulfuric acid, Nitric acid.
A base is a substance that can abstract the proton or donate the hydroxide ion that has the higher values of pH. Some of the examples of bases are sodium hydroxide and potassium hydroxide.
Neutral compounds are neutral and the example is water.
Zinc is a metal and has electropositive nature, it is useful for the reduction of chemical compounds.
When $HCl$ is added to Zinc metal, chemical reaction occurs by vigorously bubbles, these produced bubbles are due to the formation of Hydrogen gas. The formation of bubbled Hydrogen gas indicates the reaction occurred between $HCl$ and Zinc metal.
The chemical reaction can be represented as below:
$Zn + 2HCl \to ZnC{l_2} + {H_2}$

Note:
When Hydrochloric acid is added to Zinc metal, along with the formation of bubbled hydrogen gas, the salt zinc chloride can also be obtained. But, the vigorously evolved hydrogen gas indicates the formation of products and also occurrence of the chemical reaction.