Question :

Which gas is usually liberated when an acid reacts with a metal? Explain with a suitable example. 




Class 10



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Answer / Solution

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.

Answer / Solution

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.

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