Class 10 NCERT Science Activity 2.3 Explanation

In this post, you will find Class 10 NCERT Science Activity 2.3 Explanation in detail. This activity is based on chapter 2 Acids, Bases, and Salts of class 10 science. You can also go through activity 2.4 of this chapter.

Class 10 NCERT Science Activity 2.3 Explanation

 

Activity- Set the apparatus as shown in fig.

·      Take about 2 ml of dilute sulphuric acid in a test tube and add a few pieces of zinc granules to it.

·      What do you observe on the surface of zinc granules?

·      Pass the gas being evolved through the soap solution.

·      Why are bubbles formed in the soap solution?

·      Take a burning candle near a gas-filled bubble.

·      What do you observe?

·      Repeat this activity with some more acids like HCI, HNO_3, and CH₃COOH.

·      Are the observations in all the cases the same or different?

 Class 10 NCERT Science Activity 2.3 Explanation

Observation: When we bring a burning candle near a gas-filled bubble the gas burns with a popping sound.

Conclusion: Zinc metal displaces hydrogen from sulphuric acid.

Zn+ H₂SO₄ → ZnSO₄ +H₂↑

Caution: This activity needs the teacher’s assistance. 

Watch the Video to understand activity 2.3

Frequently Asked Questions

1.  Which gas is evolved when metal reacts with an acid?

   Ans.- Hydrogen gas is evolved when a metal reacts with an acid.

2.  Which reaction takes place in activity 2.3 class 10 science?

   Ans.- Displacement reaction takes place in this activity. Zinc displaces hydrogen from sulphuric acid.

3.  What is the definition of ‘Displacement reaction’?

   Ans. - The reaction in which on an atom or a group of atoms of one compound is displaced by one atom or a group of atoms, is called displacement reaction.

4.  Write the equation for the chemical reactions that takes place in activity 2.3 class 10 science.

   Ans.- Zn+ H₂SO₄ →ZnSO₄ +H₂↑

 

5.  Why burning candle is brought near the bubbles evolve from soap solution?

    Ans. To identify the evolving gas, a burning candle is brought near the bubbles. They burst with a pop sound. So the gas filled in the bubbles is hydrogen.

6.  Why are the bubbles formed in the soap solution in activity 2.3 class 10 science?

    Ans.- Hydrogen gas tries to escape from the soap solution. When hydrogen gas enters a soap solution, it forms

 bubbles

Related Topics -

1. Activity 2.4

2. Activity 2.2

2. Solutions of Chapter 2 

3. MCQ Questions of Chapter 2

4. Extra Questions of Chapter 2