Which gas is usually liberated when an acid reacts with a metal? Explain with a suitable example.
Science
Class 12
1990
Anaisha
Hydrogen gas is liberated when an acid reacts with a metal. For example, when zinc metal reacts with dil.
HCL Hydrogen is evolved and salt zinc chloride is formed as:
Zn (g) + 2HCL (aq) → ZnCl2 (aq) + H2 (g)
To test the presence of H2 gas, bring a burning splinter near the mouth of the test tube where H2 gas is released, the match stick bums with a pop sound.
Mostly, hydrogen gas is usually librated when an acid reacts with a metal.
First, take the two pieces of zinc granules in the test tube and dil H2SO4 to it. Shake it and pass the gas produced into a soap solution. After that, the bubbles of soap solution are formed. These soap bubbles contain hydrogen gas.
The CHEMICAL EQUATION is of reaction is
H2SO4 + Zn → ZnSO4 + H2
Identification of as testis, if we burning candle near the soap bubbles, it will burn with a soap sound.