Hydrogen gas is formed as the metal reacts with the acid to form a salt. Many, but not all, metals react with acids. Hydrogen gas is formed as the metal reacts with the acid to form a salt.

When acid reacts with metals, hydrogen gas is released. This is because of the chemical reaction that takes place between the acid and the metal. The acid donates hydrogen ions (H+) to the metal, which results in the formation of hydrogen gas.

Explanation:

Acids are substances that release hydrogen ions (H+) in aqueous solutions. When an acid reacts with a metal, the hydrogen ions from the acid react with the metal atoms to form hydrogen gas. The metal atoms give up electrons to the hydrogen ions, which reduces the hydrogen ions to form hydrogen gas.

For example, when hydrochloric acid (HCl) reacts with zinc (Zn), the following reaction takes place:

2HCl + Zn → ZnCl2 + H2

In this reaction, the hydrogen ions from the hydrochloric acid react with the zinc atoms to form hydrogen gas (H2). The zinc atoms give up electrons to the hydrogen ions, which reduces the hydrogen ions to form hydrogen gas.

Similarly, when sulfuric acid (H2SO4) reacts with magnesium (Mg), the following reaction takes place:

H2SO4 + Mg → MgSO4 + H2

In this reaction, the hydrogen ions from the sulfuric acid react with the magnesium atoms to form hydrogen gas (H2). The magnesium atoms give up electrons to the hydrogen ions, which reduces the hydrogen ions to form hydrogen gas.

Conclusion:

In conclusion, when acid reacts with metals, hydrogen gas is released due to the chemical reaction between the acid and the metal. This reaction is important in many industrial processes, including the production of hydrogen gas for fuel cells and other applications.

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Which gas is released when acid reacts with metals?
Question
Which gas is released when acid reacts with metals?


A
Hydrogen


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B
Nitrogen

C
Oxygen

D
Carbon

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Solution
The correct option is A
Hydrogen


An acid reacts with a metal and gives a salt with evolution of hydrogen gas.
Acid
+
metal
→
salt
+
H
2


Many reactive metals like sodium, potassium, etc. displace hydrogen from acids.

2
H
C
l
+
2
N
a
→
2
N
a
C
l
+
H
2