Question

*Concentrated hydrochloric acid reacts with zinc to form ______ gas.*

1️⃣ hydrogen
2️⃣ oxygen
3️⃣ sulphur dioxide
4️⃣ carbon dioxide​

Answer 1

to form hydrogen gas

HCl + Zn ------> H2 + ZnCl

Answer 2

Hydrogen is the correct answer.

• Reaction of an acid with metal yields salt and hydrogen gas.
• Thus, concentration hydrochloric acid, an acid reacts with metal zinc to given salt namely zinc chloride and hydrogen gas.
• It can be represented in chemical reaction form as follows -
• 2HCl + Zn -> ZnCl2 + H2. In the reaction, HCl is hydrochloric acid, Zn is zinc, ZnCl2 is zinc chloride and HE is hydrogen gas.