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Question

(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved.

(b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

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Solution

(a) Those metals which are above hydrogen in standard reduction potential series (ve E0 values) will liberate hydrogen gas on reaction with dil. acids

Eg. Zin with sulphuric acid.

For dilute acid, zinc sulfate and hydrogen gas at produced.

Zn+H2SO4ZnSO4+H2

For concentrated sulphuric acid, zinc sulfate, Sulphur dioxide, and water are produced.

Zn+conc H2SO4ZnSO4+SO2+2H2O


(b) Hydrogen gas is usually liberated when an acid reacts with a metal.

Take a few pieces of zinc granules and add 5 ml of dilute H2SO4. Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas.

Zn+H2SO4ZnSO4+H2

We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.



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