MCQ Questions | Class 10 Science Chapter 1 | Chemical Reactions and Equations with Answers

MCQ | Class 10 Science Chapter 1 | Chemical Reactions and Equations Set B

Check the below NCERT MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Pdf free download. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. We have Provided Chemical Reactions and Equations Class 10 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | Science Class 10 Chapter 1

NCERT Solutions Class 10 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	10th
Subject:	Science
Chapter:	1
Chapters Name:	Chemical Reactions and Equations
Medium:	English

Class 10th Science Book | Objective Type Questions

You can refer to NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Chemical Reactions and Equations | Class 10 Science | NCERT Solutions

Q1.	Assertion: MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O is redox reaction.Reason: MnO₂ oxides HCl to Cl₂ and gets reduced to MnCl.
	A. Both A and R are true and R is the correct explanation of A.
	B. Both A and R are true but R is not the correct explanation of A.
	C. A is true but R is false.
	D. A is false but R is true.

Ans: Both A and R are true and R is the correct explanation of A.

Q2.	Assertion: Magnesium ribbon keeps on burning in atmosphere of nitrogen. Reason: Magnesium reacts with nitrogen to form magnesium nitrides and this reaction is combination reaction.
	A. Both A and R are true and R is the correct explanation of A.
	B. Both A and R are true but R is not the correct explanation of A.
	C. A is true but R is false.
	D. A is false but R is true.

Ans: Both A and R are true and R is the correct explanation of A.

Q3.	Heat is evolved during:
	A. Endothermic Reaction
	B. Displacement Reaction
	C. Combustion Reaction
	D. Combination Reaction

Ans: Combustion Reaction

Q4.	Dissolving suger is an example of
	A. Physical change
	B. Chemical change
	C. Redox Reaction
	D. None of these.

Ans: Physical change

Q5.	A substance added to food containing fats and oils is called:
	A. Oxidant
	B. Rancid
	C. Coolant
	D. Antioxidant

Ans: Antioxidant

Q6.	Select the oxidising agent for the following reaction: H₂S + I₂ > 2HI + S
	A. I₂
	B. H₂S
	C. HI
	D. S

Ans: I₂

Q7.	A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
	A. CaOCl₂
	B. Ca (OH)₂
	C. CaO
	D. CaCO₃

Ans: Ca (OH)₂

Q8.	The process of reduction involves
	A. addition of oxygen
	B. addition of hydrogen
	C. removal of oxygen
	D. removal of hydrogen

Ans: addition of hydrogen

Q9.	Which of the following gases can be used for storage
	A. Carbon dioxide or Oxygen
	B. Nitrogen or Oxygen
	C. Carbon dioxide or Helium
	D. Helium or Nitrogen

Ans: Helium or Nitrogen

Q10.	Pb + CuCl₂ → PbCl₂ + Cu This reaction is an example of:
	A. combination
	B. displacement
	C. decomposition
	D. double displacement

Ans: displacement

Q11.	When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because:
	A. it is decomposed to ferric oxide
	B. it loses water of crystallisation
	C. it forms SO₂
	D. it forms SO₃

Ans: it loses water of crystallisation

Q12.	What is observed when a solution of potassium iodide is added to silver nitrate solution?
	A. No reaction takes place
	B. White precipitate of silver iodide is formed
	C. yellow precipitate of Agl is formed
	D. Agl is soluble in water.

Ans: yellow precipitate of Agl is formed

Q13.	PbS reacts with ozone (O₃) and forms pbso₄. As per the balanced equation, molecules of ozone required for every one molecule of PbS is/are
	A. 4
	B. 3
	C. 2
	D. 1

Ans: 4

Q14.	Chemically rust is
	A. Hydrated ferrous oxide
	B. hydrated ferric oxide
	C. only ferric oxide
	D. none of these

Ans: hydrated ferric oxide

Q15.	Which of the following reactions will not take place?
	A. Zn + CuSO₄ → ZnSO₃ + Cu
	B. 2KBr + Cl₂ →KCI+ Br₂
	C. Zn + MgSO₄ → ZnSO₄ + Mg
	D. Mg + FeSO₄ – MgSO₄ + Fe

Ans: Zn + MgSO₄ → ZnSO₄ + Mg

Q16.	Which of the following is a thermal decomposition reaction?
	A. 2H₂O → 2H₂ + O₂
	B. 2AgCl → 2Ag + Cl₂
	C. H₂(g) + Cl₂(g) → 2HCl(g)
	D. ZnCO₃ → ZnO + CO₂