Which gas is usually liberated when an acid reacts with a metal? illustrate with an example. how will you test for the presence of this gas?

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? Answer The reaction of Acids and Metal leads to the formation of a salt. Hydrogen being common to all acids gets displaced in the reaction and is evolved as hydrogen gas.

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Reaction of an acid with a metal: • When an acid reacts with a metal, it forms a salt. • Hydrogen which is in all the acids gets displaced and liberated as hydrogen gas. Acids + Metals → Salt + Hydrogen gas Example: • Hydrogen gas is produced when dilute HCl combines with zinc metal. Zn s + 2 HCl aq → ZnCl 2 aq + H 2 g Test for the presence of hydrogen gas: • A lighted splint positioned near the mouth of a test tube ignites with a squeaky pop if hydrogen is present.

Hydrogen gas is usually liberated when an acid reacts with a metal. Take few pieces of zinc granules and add 5 ml of dilute H 2SO 4. 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. H 2SO 4+Z n→ Z nSO 4 + H 2↑ We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.

• NCERT Solutions Menu Toggle • NCERT Solutions for Class 12 • NCERT Solutions for Class 11 • NCERT Solutions for Class 10 • NCERT Solutions for Class 9 • NCERT Solutions for Class 8 • NCERT Solutions for Class 7 • NCERT Solutions for Class 6 • NCERT Books • TS Grewal Solutions • MCQ Questions Menu Toggle • NCERT MCQ Question 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube? Answer: We dip the red litmus paper in any one of the three test tubes. If there is no change in the colour of the litmus paper, it means this test tube contains water or acidic solution. If the colour of the red litmus paper turns blue, it means this test tube contains basic solution. Now, again we dip this litmus paper in any one of the remaining two test tubes. If we do not observe any change in the colour of the litmus paper it is surely water and if a colour change is noticed, then it will be an acidic solution. In-text Questions (Page 22) Question 1. Why should curd and sour substances not be kept in brass and copper vessels? Answer: Brass is an alloy of copper and zinc, Brass and copper vessels reacts with atmospheric oxygen and to form metal oxides. The nature of metal oxides is basic. Curd and sour substances contains acids, e.g., curd contains lactic acid and orange contains citric aci...