Free Class 10 Science Chapter 3 Chemical Reactions and Equations questions answers

Class 10 Science Chapter 3 Chemical Reactions and Equations questions answers

We offer free Maharashtra Board Class 10 Science Chapter 3 Chemical Reactions and Equations questions answers in Pdf format. Our expert team have gone through this chapter and prepared Notes for the students who are facing difficulties in summarizing of this chapter. We assure you that you can score more marks by using our Pdf files. Let us tell you that all the questions answers in concern with this chapter are prepared by our expert teachers team. Here you will find three Pdf files, among them first Pdf files consists of Textbook Questions Answers whereas in second Pdf files you will get the additional extra questions for practices. In the third and last Pdf files, you will get full exercise of this chapter.

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Board Class Chapter
Maharashtra state Board Std 10Chapter 3 Chemical Reactions and Equations

Class 10 Science Chapter 3 Chemical Reactions and Equations questions answers in Pdf format:

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Chapter NamePdf Solutions
Chemical Reactions and Equations
( Text book ) Exercise
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Chemical Reactions and Equations
(Additional Extra) Exercise
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Chemical Reactions and Equations
(Entire) Exercise
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Class 10 Science Chapter 3 Chemical Reactions and Equations: Notes

As we go through the entire Class 10 Science Chapter 3 Chemical Reactions and Equations, we can see there are so many questions asked meanwhile and students are expected to answers them. Some students may face some problem while answering it , but we promise you that after reviewing our answer, you will gain the confidence to answers such questions. Our expert team teacher have divided the solutions into several parts,which will help you to understand this chapter better. Have a look at the following parts:

  • Chemical Reactions and Equations (Can you recall?)
  • Chemical Reactions and Equations (Use your brain power)
  • Chemical Reactions and Equations (Observe/Discuss:)
  • Chemical Reactions and Equations (Let’s Discuss:)
  • Chemical Reactions and Equations (Observe:)
  • Chemical Reactions and Equations (Let’s think:)
  • Chemical Reactions and Equations (Paragraph based questions:)
  • Chemical Reactions and Equations (Questions based on tables and charts:)
  • Chemical Reactions and Equations (Activity based questions:)
  • Chemical Reactions and Equations (Projects:)

Class 10 Science Chapter 3 Chemical Reactions and Equations: Question Bank

All those students who are preparing for the final exam and want to score more marks on board can refer to our question bank, among them are some questions may ask you in your final examination.

Beneath, in our Pdf documents, you get the Class 10 Science Chapter 3 Chemical Reactions and Equations questions answers, however our expert crew have faith in the query bank that allows you to help the students to get more marks.
Our expert team of teachers has prepared the best solutions to these questions. All the answers to these questions are given in our PDF file, which is given below. You can download it for your later study. In Our Pdf file of solutions of the Chapter 3 Chemical Reactions and Equations, you will find the solutions of Important Question bank given below.

We hope that this question bank will help you a little for your exam preparation.

Important Questions Bank

Question 1. Organic waste is decomposed by micro-organism and as a result manure and……..are formed.

Question 2. ……….is formed on mixing yeast in glucose solution under proper condition.

Question 3. The chemical reaction during which H2(g) is lost is termed as………

Question 4. Corrosion can be prevented by using………

Question 5. The chemical reactions in which heat is liberated are called………..reactions.

Question 6. The chemical formula of rust is………

Question 7. A reaction in which heat is absorbed is called………reaction.

Question 8. The process of rusting or iron is………process.

Question 9. when oil and fats are oxidised or even allowed to stand in air for a long time, they become 

Question 10. ……… are used to prevent oxidation of food.

Question 11. Carbon dioxide is passed through water. The reaction is a………reaction.

Question 12. Calcium carbonate is heated. The reaction is a………..reaction.

Question 13. Zinc strip is dipped in a CuSO4 solution. The reaction is a……….reaction.

Question 14. Silver nitrate solution is added to NaCl solution. The reaction is a……….reaction.

Question 15. The slow process of decay or destruction of a metal due to effect of air, moisture and acids on it is known as……….

Rewrite the following statements by selecting the correct options:

Question 1. The reaction of iron nail with copper sulphate solution is………reaction. (March 2019)

(a) double displacement

(b) displacement

(c) combination

(d) decomposition

Question 2. Reddish brown deposit formed on iron nails kept in a solution of copper sulphate is

(a) Cu2O

(b) Cu

(c) CuO

(d) CuS

Question 3. The reaction CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s) is a……..reaction.

(a) displacement

(b) double displacement

(c) decomposition

(d) combination

Question 4. ………is a combination reaction.

(a) Cu + H2SO4 → CuSO4 + H2

(b) H2 + Cl2 → 2HCl

(c) \(2 \mathrm{HgO} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Hg}+\mathrm{O}_{2}\)

(d) \(\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}\)

Question 5. ………..a decomposition reaction.

(a) \(\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}\)

(b) H2O + CO2 → H2CO3

(c) CaS + 2HCl → CaCl2 + H2S

(d) 2H2 + O2 → 2H2O

Question 6. In a chemical equation the……….are written on the left hand side.

(a) products

(b) reactants

(c) catalysts

(d) elements

Question 7. The Δ sign written above the arrow indicates………..of the reaction.

(a) reactant

(b) product

(c) heat

(d) direction of the reaction

Question 8. The reaction KNO3(S) + H2O(l) + Heat → KNO3(aq) is a/an……….reaction.

(a) exothermic

(b) endothermic

(c) oxidation

(d) reduction

Question 9. The reaction NaOH(S) + H2O(l) → NaOH(aq) is a/an……..reaction.

(a) exothermic

(b) endothermic

(c) oxidation

(d) reduction

Question 10. A solution of Al2(SO4)3 in water is……….

(a) blue

(b) pink

(c) green

(d) colourless

Question 11. Carbon dioxide………..

(a) turns lime water milky

(b) is odourless

(c) is colourless

(d) All the three (a), (b) and (c) are correct

Question 12. ……….is the correct set up to pass CO2 through lime water.

Class 10 Science Chapter 3 Chemical Reactions and Equations

Answer: Correct set up D.

Question 13. when……..is passed through fresh lime water, it turns milky.

(a) H2

(b) CO

(c) CO2

(d) SO2

Question 14. Magnesium reacts with con. HCl to form………..salt.

(a) copper chloride

(b) ferrous chloride

(c) calcium chloride

(d) magnesium chloride

Question 15. Zinc reacts with hydrochloric acid. The reaction is a reaction.

(a) combination

(b) decomposition

(c) displacement

(d) double decomposition

Question 16. In a double displacement reaction,………… (Practice Activity Sheet – 1)

(a) ions remain at rest

(b) ions get liberated

(c) ions are exchanged

(d) ions are not created

State whether the following statements are True or False:

Question 1. Rusting of iron is a fast reaction.

Question 2. Milk is set into curd is a chemical change.

Question 3. The reaction between salt and water is an example of exothermic reaction.

Question 4. The speed of a chemical reaction depends on the catalyst used in the chemical reaction.

Question 5. The simple form of representation of a chemical reaction in words is known as word reaction.

Question 6. Nascent oxygen is always denoted by showing the symbol of oxygen.

Question 7. Antioxidants are used to prevent oxidation or food containing fats and oils.

Question 8. When oils and fats are allowed to stand for a long time, they become rancid.

Question 9. The chemical formula of rust is Fe3O4 .xH2O.

Question 10. Glucose combines with oxygen in our body and provides energy. The reaction is an endothermic reaction.

Question 11. Chemical reactions in which reactants gain oxygen are reduction reactions.

Question 12. CuSO4(aq) + Znl(s) → ZnlSO4(aq) + Cu(s) is an example of decomposition reaction.

Question 13. The chemical reactions in which heat is liberated are called endothermic reactions.

Question 14. The product or insoluble solid in chemical reaction is indicated by an arrow pointing upwards.

Question 15. The rate of a reaction increases on increasing the temperature.

Question 16. The digestion of food is a chemical decomposition process.

Question 17. The reaction between sodium hydroxide and hydrochloric acid is a slow reaction.

Question 18. When calcium carbonate is heated, it decomposes into calcium oxide and oxygen gas.

Answer: False (when calcium carbonate is heated. it decomposes into calcium oxide and carbon dioxide gas.

Question 19. The rate of a chemical reaction changes in presence of catalyst.

Question 20. Chlorines is an oxidant.

Taking into consideration the relationship in the first pair, complete the second pair. (OR) Complete the following:

Question 1. 2H2 + O2 → 2H2O Combination reaction :: 2HgO → 2Hg + O2 :……….

Question 2. NH3 + HCl → NH4Cl : Combination reaction :: Fe + CuSO4 → FeSO4 + Cu :……..

Question 3. 2C2H5OH + 2Na → 2C2H5ONa + H2 : Oxidation :: CuO + H2 → Cu + H2O :……….

Question 4. CuCl2 + 2KI → CuI2 + 2KCl : Double displacement :: Zn + 2HCl → ZnCl2 + H2 :……….

Question 5.

Class 10 Science Chapter 3 Chemical Reactions and Equations

Question 6. CuI2 : Brown :: AgCl :……….

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