Class 10th ch-1 [Activity-Based Questions/Answers] Chemical Reaction and Equations.

Class 10th ch-1 [Activity-Based Questions/Answers] Chemical Reaction and Equations.
Class 10th ch-1 [Activity-Based Questions/Answers] Chemical Reaction and Equations.

Class 10th ch-1 Activity-Based Questions/Answers:- Learning and solving the Activity-based problems of this chapter will really help you in understanding chemistry and its formula in a very easy way.

You know, 80% of students take chemistry as a difficult subject. Because they can’t memorize the formulas of Chemistry. But trust me this is very simple.

Once you will understand the Activities of the chapter then you will be able to make formulas on your own. Memorizing Formulas in this way is really a super-easy way. So, understand each and every activity of any chapter. It will become very easy for you to memorize the formulas of the chapter.

Chemistry is the only part of Science in which you can easily score full marks in your Board exams. And especially form this chapter every year in board exams one Activity-based Question of 5 marks asked. So that’s why you can’t leave this chapter.

Then let’s get started.

Download Pdf of NCERT class 10th chapter-1 (Chemical reactions and Equations)

Activity 1.1 Full Explanation:-

Activity no. 1.1 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

In this Activity, From the above Image, you understand the Procedure to do the reaction. But what you will get after the Reaction will be completed.

Watch the video below to understand the full Procedure:-


Source:- SCIENCE CLASSES VIJAYAKUMAR N

When you heat the Magnesium in the Presence of Oxygen Then it starts burning with the White Dazzling white Flame and then converted into the White color powder that is Magnesium Oxide. (MgO)

====>> Some Important Questions Related to this Activity:-

Q. What will happen when magnesium ribbon is burnt in air?

When magnesium Ribbon Burns it produces the white dazzling flame as you see in the above video. After burning a white color powered compound MgO(Magnesium oxide) is Produced.

Q. What is the Color of magnesium?

The color of magnesium is silvery-white. And after Burning in the presence of Oxygen the color Changes to white(MgO===> Magnesium oxide).

Activity-based questions class 10 science activity 1.2

Activity no. 1.2 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

Again from the Above image, you Understand what the procedure to Do for Performing this reaction. Watch this video till End to understand the Procedure with more clarification.

Watch this Video:-


Source:- Aron Walker

In this activity of Ncert, When Lead Nitrate [Pb(NO3)2] reacts with Potassium Iodide(Ki) a yellow color of Precipitate(ppt.) is Formed. You can see above in the video, How the reaction takes place.

When two Colourless compound Lead nitrate and Potassium Iodide combine with each other they form a New yellow color semi-soluble Compound that is Lead Iodide(PbI2). This reaction was also an example of a Double Displacement reaction.

Important Questions Related to this Activity:-

Q. What is Precipitation Reaction?

This is a type of reaction in which when two Aqueous soluble solutions Combine/React together to form a semi-soluble Salt and that salt is called as Precipitate.

And in any reaction, when Precipitate is formed then, that is called a Precipitation reaction.

Q. Give some More Examples of Precipitation Reaction?

Some more examples of Precipitation reactions are:-

  • AgNO3(aq) + KCl(aq) —–AgCl(ppt.) + KNO3(aq)
  • 2KOH(aq) + CaCl2(aq)—-Ca(OH)2(aq) + 2KCl(aq)

Activity 1.3

Activity no. 1.3 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

Once Again watch this Video and see the above image you will get the Clear-cut Knowledge about how to do perform this Activity.

Video related to this Activity:-
Source:- Crazy Indian Hacker

In this activity, When you add Zn granules(very small pieces of zinc) to the dilute HCl(Hydrochloric acid) then you will observe the rise in Temperature of the Conical Flask and also hydrogen gas will produce.

You can feel the heat just by touching the Conical Flask and for Testing the Hydrogen you can do a soap water test.

This is also an Exothermic Reaction as well as Displacement Reaction.

Questions Related to Activity 1.3 class 10th Science:-

Q. Why it is Recommended always to use Dilute Acids?

There are many reasons But according to your syllabus:

  • Because, If the Concentration of the Acid will be higher than it will be a More Exothermic Reaction and if the activity will not be completed in the presence of the right Mentor then it can be very harmful.
  • To prevent the danger. Because you all know how Acids are harmful If the concentration will be higher it can Even burn the skin. And to prevent Danger, we use the highly dilute Acid.

What happened when Zn Granules are added to the HCl/H2SO4?

Hope you find your answer in the above Activity Explanation.

**The reaction for the Above activity is here:

Activity 1.4

Activity no. 1.4 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

**Calcium oxide(CaO) is also known as Quick Lime. & Calcium Hydroxide{Ca(OH)2} is Known as Slaked Lime.

Source:- Sully Science

In this Above Activity(1.4) when Calcium oxide (CaO) or Quick lime Reacts with H2O water then it produces Calcium Hydroxide[Ca(OH)2] or Slaked Lime. Also the heat is produced During this reaction. That’s why this is also an Example of Exothermic Reaction.

Important Questions related to this chapter.

Q.-***What happened when Calcium Oxide reacts with H2O? OR… What happened when Quick lime reacts with water?

When CaO (Quick lime/Calcium oxide) Reacts with the water to form a new compound called Slaked lime [Ca(OH)2]. Also, the heat is produced at the time of reaction.

Q. Write some more Examples of Combination Reactions?

(i) Burning of coal:-
C(s) + O2(g) → CO2(g)
(ii) Formation of water:-
2H2(g) + O2(g) → 2H2O(l)

Activity 1.5

Activity no. 1.5 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

In this Activity, When we heat the Green color Crystals of FeSO4 (Iron Sulphate) then it gets converted into Fe2O3 (Iron oxide/ferric oxide) a reddish-brown colored Compound. Also the SO2 (Sulphur dioxide) and SO3 (Sulfur tri-Oxide) gas Releases.

Some Important Questions Related to this Activity:-

Q. Give some examples of Decomposition Reaction?

***2FeSO4(s) ⎯→ Fe2O3(s) + SO2(g) + SO3(g)

***CaCO3(s) ⎯→CaO(s) + CO2(g)

***2Pb(NO3)2(s) ⎯→ Heat 2PbO(s) + 4NO2(g) + O2(g)

Q. What is Wafting gas?

SO2 and SO3 are the colorless gases which are colorless and pungent smell. These gases are harmful to health.

Activity 1.6

Activity no. 1.6 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

Basically, This reaction is a Thermal Decomposition Reaction such as the upper one.

In this activity, When you will heat Lead nitrate [Pb(NO3)2] in the presence of heat then a brown color Nitrogen di-oxide (NO2) gas will produce.

***Pb(NO3)2—> This is a White color compound and when we heat it in the Presence of Oxygen then NO2 gas is produced which is Brown in Colour.

Important Question related to this Topic:-

Q. What is the Equation for the Following Reaction?

—–** 2Pb(NO3)2(s) ⎯→ Heat 2PbO(s) + 4NO2(g) + O2(g)

**Activity 1.7

Activity no. 1.7 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

Does this activity tell us about the Electroyotic decomposition Reaction?

Important Questions Related to this Activity:-

***Why the amount of one gas produced in one Test tube is Double than the other one?

Ans:- H2 + O2—-> H2O Hydrogen gas and the oxygen gas formed are always in the ratio of 2:1 in 1 molecules of water. Therefore the volume of gas collected in the first test tube is double the volume of the gas collected in the second test tube.

Activity 1.8

Activity no. 1.8 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

This reaction is the Example of Photolytic decomposition Reaction. In the above image, it is clearly defined as the procedure of the Reaction.

See this Video to get more clarification about this Activity:-

In this activity, When we keep Silver Chloride (AgCl) in the presence of Sunlight then the Silver-white color of the Silver Chloride changes to Grey.

This is Because of the Decomposition of the AgCl to Silver and Chlorine gas [2AgCl(s) ⎯→2Ag(s) + Cl2(g)]

Important questions related to this Exercise:-

Why AgCl kept in a Black color of Botel?

As you know now, AgCl is a photolytic Decomposing material that’s why when we kept AgCl in a black color bottle to protect it from the Sunlight.

Q. Give some examples of more Photolytic Docomposing Substances and their Relations?

2AgBr(s) Sunlight ⎯ → ⎯⎯⎯⎯ 2Ag(s) + Br2(g)

Q. Which Reaction is Used for Black and White Photography?

Ans. 2AgBr(s) Sunlight ⎯ → ⎯⎯⎯⎯ 2Ag(s) + Br2(g), This reaction is also Similar to the Above one(2AgCl—–=> 2Ag + Cl2). And this Reaction is used for the Black and white Photography.

Activity 1.9

Activity no. 1.9 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

See the above Image, What will be the Procedure to do this Activity.

This activity tells us About the Displacement Reaction that how it takes place what changes we can observe after the reaction will takes place.

How to do this activity? And Get complete/Detailed Information about how to perform this Activity.

Some Important Questions related to this Activity?

Q. Why does the Iron nail become brownish in color and the blue color
of copper sulfate solution fade?

In this reaction, the Iron nail becomes brownish in color and the blue color of copper sulfate solution fade Because Iron displaces Cu (Copper) from its Positon (CuSO4) Copper Sulphate. Because Iron is more reactive than Copper and it easily displaces Cu(Copper) from Copper Sulphate(CuSO4).

And that’s why the color of CuSO4 solution changes from Blue color to ade because finally the solution of Copper sulfate was got to converted into Iron Sulphate (FeSO4).

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Activity 1.10

Activity no. 1.10 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

Read the above Infographic you will get all the details that how to do perform this activity. and see the related video below that how to perform this Activity in Laboratory.

As you know, This reaction is an Example of Double Displacement Reaction.

Activity 1.11

Activity no. 1.11 Class 10th ch-1 Activity-Based Questions/Answers ClassXscience

From this Activity most of the time the Questions not came to the exam and the things which are Important from this Activity are:- What is Redox Reaction and what are the examples of Redox Reactions.

Hope you all find your answer if you have any doubt related to this topic then please let me known in the comment section.

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