Class 10 Science Chapter 1 MCQ

Class 10 Science Chapter 1 MCQ (Multiple Choice Questions) of Chemical Reactions and Equations. All the questions are taken from NCERT Textbook, ten years papers, exemplar books, CBSE Sample papers and different popular books for academic session 2020-21.

There are 25 sets of MCQ tests containing total of 125 questions with answers and explanation. We have uploaded all the questions carefully. For any error, please take screen shot and send us for modification.

Class 10 Science Chapter 1 MCQ for 2020-21

Class: 10 Science
Contents:Multiple Choice Questions – MCQ Tests

Class 10 Science Chapter 1 MCQ Tests 2020-21

Class 10 Science Chapter 1 MCQ are given below. There total of 5 questions in each test. You can attend more and more test to evaluate your practice. MCQs are now important for CBSE Exams also. Answers and explanation of each question is given just below the questions. If you have any doubt, please ask in discussion forum.

Q1

Naveen appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

[A]. All the decomposition reaction are endothermic reactions.
[B]. The decomposition of calcium carbonate is an endothermic reaction.
[C]. Photosynthesis is an endothermic reaction.
[D]. Electrolysis of water form hydrogen and oxygen is an exothermic reaction.
Q2

Pooja is writing some statements. She wants to know in which of the following statements is or are incorrect?

[A]. When hydrogen burns in oxygen to form water.
[B]. Liquid hydrogen burns to lift the space shuttle out of the earth’s gravitational field.
[C]. When glucose undergoes to slow combustion by combining with oxygen in the cells of our body to produce energy.
[D]. As a fuel CNG and LPG gives more energy than hydrogen.




Q3

Consider the following statements, choose the incorrect one(s):

[A]. The chemical equation is balance to satisfy the law of conservation of mass in chemical reaction.
[B]. We should never change the formula of an element or compound to balance and equation.
[C]. Those reaction in which heat is evolved are known as exothermic reactions.
[D]. When Methane (CH4) burns in oxygen of air it forms carbon monoxide and water vapour.
Q4

Rahul is writing some statements, choose the correct statement and help him:

[A]. The substance which combine or react are known as reactants.
[B]. The new substances produced in a reaction are known as products.
[C]. A chemical equation is a shorthand method of representing a chemical reaction.
[D]. All the above.




Q5

In which of the following statements is or are incorrect?

[A]. Some chemical reactions are characterized by the formation of a precipitate.
[B]. A precipitate is a liquid product which separate out from the solution during a chemical reaction.
[C]. Yellow precipitate of lead iodide is formed when potassium iodide solution is added to the solution of lead nitrate.
[D]. A precipitate can also form by passing a gas into an aqueous solution of a substance.
Q6

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime water. Which among the following is/are true about slaking of lime water and the solution formed?

[A]. It is an endothermic reaction, and It is exothermic reaction.
[B]. It is exothermic reaction, and The pH of the resulting solution will be more than seven.
[C]. It is an endothermic reaction, and The pH of the resulting solution will be less than seven.
[D]. The pH of the resulting solution will be more than seven, and The pH of the resulting solution will be less than seven.
Q7

Which among the following (are) double displacement reaction (s)?

[A]. Pb + CuCl2 → PbCl2 + Cu, and CH4 + 2O2 → CO2 + 2H2O
[B]. Na2SO4 + BaCl2 → BaSO4 + 2NaCl
[C]. Pb + CuCl2 → PbCl2 + Cu, and Na2SO4 + BaCl2 → BaSO4 + 2NaCl
[D]. C + O2 → CO2, and CH4 + 2O2 → CO2 + 2H2O
Q8

It is advised that before burning in air, the magnesium ribbon is cleaned by rubbing with sandpaper. Why?

[A]. So that, it may readily combine with the oxygen of air.
[B]. So that, it may looks very shining.
[C]. So that, it can easily see by naked eyes at the time of burning.
[D]. None of the above.



Q9

Which of the following statements about the given reaction is correct? 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

[A]. Iron metal is getting oxidized, Water is getting reduced, Water is acting as reducing agent.
[B]. Water is acting as reducing agent, Water is acting as oxidising agent.
[C]. Iron metal is getting oxidized, Water is getting reduced, Water is acting as oxidising agent.
[D]. Water is getting reduced, Water is acting as oxidising agent.
Q10

Which of the following is not a physical change?

[A]. Boiling of water to give water vapour.
[B]. Melting of ice to give water.
[C]. Dissolution of salt in water.
[D]. Combustion of Liquefied Petroleum Gas (LPG).

Prepare Class 10 Science Chapter 1 Chemical Reactions and Equations from NCERT Textbook and then practice the questions given in the end of the chapter. At this stage MCQs are important for the revision of concepts and missing terms related to the chapters. If you read 5 times the same chapter from NCERT, every time you will get something new again. It means we have to revise the chapter again and again.



Is Class 10 Science Chapter 1 Chemical Reactions and Equations important for MCQ?

There are so many questions in chapter 1 of class 10 science, which may be asked in CBSE Board exams as MCQs.

Should I prepare Activities also, given in Chapter 1 of class 10 Science, for MCQ?

Activities are important not only for MCQ, but the theoretical questions also. In CBSE 2020 exams, there were three questions based on activities.

Are MCQ asked from back exercises of Class 10 Science chapter 1?

MCQs can be asked from entire book, whether it is intext questions or end exercises questions.

How do I prepare for MCQs of 10th Science Chapter 1?

Prepare the chapter 1 NCERT Textbook of class 10 science and read each important reaction carefully. MCQs are generally asked from with in the chapter text.