Answer :
All the mentioned metals, that is zinc, cobalt and nickel react with hydrochloric acid.
The chemical reaction is as follows -
Zn + 2HCl -> [tex] ZnCl_{2}[/tex] + [tex] H_{2}[/tex]
Co + 2HCl -> [tex] CoCl_{2}[/tex] + [tex] H_{2}[/tex]
2Na + 2HCl -> 2NaCl + [tex] H_{2}[/tex]
In these balanced redox chemical reaction, reactants are Zinc, Cobalt, Sodium and Hydrochloric acid. The products are [tex] ZnCl_{2}[/tex] represents zinc chloride, [tex] CoCl_{2}[/tex] represents cobalt chloride, NaCl represents sodium chloride and [tex] H_{2}[/tex] hydrogen.
The metals in the above reactions are in solid phase and react to release the hydrogen gas. The salts are also in solid form. However, the reaction between cobalt and hydrochloric acid leads no visible reaction.
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