# Chapter 1 Chemical Reactions and Equations MCQs for Class 10 Science

#### Chapter 1 Chemical Reactions and Equations MCQs for Class 10 Science

Here students can practice Chapter 1 Chemical Reactions and Equations MCQs for Class 10 Science. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the buttons. Also you can practice Class 10 Science MCQs (Multiple Choice Questions) for other chapters.

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Q 1.: Which of the following reactions can also be termed as thermal decomposition reaction?

(A)  Combination Reaction

(B) Decomposition Reaction

(C) Double displacement reaction

(D) Displacement reaction

Option – (b)

Q 2.:  A student performs an experiment to form aluminium chloride from aluminium and chlorine. Which options give the chemical equation of the reaction?

(A) Al + Cl2 → AlCl2

(B) 2Al + 3Cl2 → 2AlCl3

(C) 2Al + Cl2 → 2AlCl

(D) 3Al + 3Cl2 → 3AlCl3

Option – (b)

Q 3.: Give the ratio in which hydrogen and oxygen are present in water by volume.

(A) 1:2

(B) 1:1

(C) 1:8

(D) 2:1

Option – (d)

Q 4.: Sodium and chlorine are reacted and as a result, sodium chloride is formed which is also called table salt. What option gives the reactants and products of the reaction?

(A) Reactants – sodium; products – chlorine

(B) Reactants – tables salt; products – sodium and chlorine

(C) Reactants – sodium and table salt; products – chlorine

(D) Reactants – sodium and chlorine; products – sodium chloride

Option – (d)

Q 5.: The chemical formula of magnesium oxide is?

(A)  Mg2O

(B)  MgO

(C) MgO2

(D)  Mg(OH)2

Option – (b)

Q 6.: In the reaction, $$xKClO_{3} \overset{Heat}{\rightarrow} yKCl + zO_{2}$$ the values of  x,y and z are

(A) 1,2,3

(B) 2,1,3

(C) 2,2,3

(D) 2,2,1

Option – (c)

Q 7.: Which of the following involves a chemical reaction?

(A) Storing of oxygen gas under pressure in a gas cylinder

(B) Liquefication of air

(C) Keeping petrol in a china dish in open

(D) Heating copper wire in the presence of air at high temperature

Option – (d)

Q 8.: The following reaction is used in laboratory for the preparation of oxygen gas:

$$2KClO_{3}(s)\xrightarrow[Catalyst]{Heat}2KCl(s) + 3O_{2}(g)$$

Which one of the following statements satisfies this reaction?

(A) It is a decomposition reaction and endothermic in nature.

(B) It is a combination reaction.

(C) It is a decomposition reaction and exothermic in nature

(D) It is photochemical decomposition reaction and exothermic in nature

Option – (a)

Q 9.: Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(A) 1:1

(B) 2:1

(C) 4:1

(D) 1:2

Option – (c)

Q 10.: The reaction, $$Fe_{2}O_{3}(s)+2Al(s)\rightarrow Al_{2}O_{3}(s)+2Fe(s)$$  is an example of

(A) Displacement reaction

(B) Decomposition reaction

(C) Combination reaction

(D) Double displacement

Option – (b)

Q 11.: To prevent the chips from going rancid, the bags of chips are flushed with

(A) Hydrogen

(B) Nitrogen

(C) Oxygen

(D) Carbon dioxide

Option – (b)

Q 12.: Which of the following are exothermic process?

(A) Reaction of quicklime with water

(B) Dilution of sulphuric acid

(C) Evaporation of water and  Sublimation of camphor

(D) (a) and (b)

Option – (d)

Q 13.: Decomposition of a substance by an electric current is called

(A) Electrical synthesis

(B) Electrolysis

(C) Electrophoresis

(D) Electroosmosis

Option – (b)

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We hope that these Chapter 1 Chemical Reactions and Equations MCQs for Class 10 Science helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 1 Chemical Reactions and Equations MCQs for Class 10 Science, click on the question range given above.

Also you can practice Class 10 Science MCQs (Multiple Choice Questions) for other chapters.