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

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

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.	What happens when dilute hydrochloric acid is added to iron filling? Tick the correct answer
	A. Hydrogen gas and iron chloride are produced.
	B. Chlorine gas and iron hydroxide are produced
	C. No reaction takes place
	D. Iron salt and water are produced

Ans: Hydrogen gas and iron chloride are produced.

Q2.	Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas. Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as precipitation 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 but R is not the correct explanation of A.

Q3.	The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
	A. Decomposition Reaction
	B. Displacement Reaction
	C. Double Displacement Reaction
	D. Neutralisation Reaction

Ans: Double Displacement Reaction

Q4.	The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
	A. Antioxidation
	B. Reduction
	C. Rancidity
	D. Corrosion

Ans: Rancidity

Q5.	The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
	A. Decomposition Reaction
	B. Displacement Reaction
	C. Double Displacement Reaction
	D. Neutralisation Reaction

Ans: Double Displacement Reaction

Q6.	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

Ans: 2:1

Q7.	What type of chemical reactions take place when electricity is passed through water?
	A. Displacement
	B. Combination
	C. Decomposition
	D. Double displacement

Ans: Decomposition

Q8.	Which of the following is an endothermic process?
	A. Dilution of sulphuric acid
	B. Sublimation of dry ice
	C. Condensation of water vapours
	D. Respiration in human beings

Ans: Sublimation of dry ice

Q9.	Oxidation is a process which involves
	A. addition of oxygen
	B. addition of hydrogen
	C. removal of oxygen
	D. removal of hydrogen

Ans: addition of oxygen

Q10.	Give the ratio in which hydrogen and oxygen are present in water by volume.
	A. 1:2
	B. 1:1
	C. 2:1
	D. 1:8

Ans: 1:2

Q11.	A substance which oxidizes itself and reduces other is known as
	A. Oxidising agent
	B. reducing agent
	C. Both (a) and (b)
	D. None of these.

Ans: reducing agent

Q12.	In an electrolytic cell where electrolysis is carried, anode has:
	A. Positive change
	B. Negative charge
	C. Connected to negative terminal of the battery
	D. None of these is correct

Ans: Positive change

Q13.	Which of the following reactions is not correct:
	A. Zn+ CuSO₄ → ZnSO₄ + Cu
	B. 2Ag + Cu(NO₃)₂ → 2AgNO₃ + Cu
	C. Fe+CuSO₄ → FeSO₄ + Cu
	D. Mg + 2HCl → MgCl₂ + H₂

Ans: 2Ag + Cu(NO₃)₂ → 2AgNO₃ + Cu

Q14.	Copper displaces which of the following metals from its salt solution:
	A. ZnSO₄
	B. FeSO₄
	C. AgNO₃
	D. NiSO₄

Ans: AgNO₃

Q15.	Which of the following involves combination of two elements?
	A. N₂(g) + 3H₂(g) + 2NH₃(g)
	B. Cao(s) + CO₂(g) → CaCO₃(g)
	C. 2SO₂(g) + O₂(g) → 2SO₃f(g)
	D. NH₃(g) + HCl(g) – NH₄CI(S)

Ans: N₂(g) + 3H₂(g) + 2NH₃(g)

Q16.	Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be:
	A. green
	B. red
	C. blue
	D. brown

Ans: blue

Q17.	When dilute HCl is added to zinc pieces taken in a test tube
	A. No change takes place
	B. the colour of the solution becomes yellow.
	C. A pungent smelling gas gets liberated.
	D. small bubbles of H₂ gas appear on the surface of zinc pieces

Ans: small bubbles of H₂ gas appear on the surface of zinc pieces.

Q18.	Magnesium ribbon is rubbed before burning because it has a coating of:
	A. basic magnesium oxide
	B. basic magnesium carbonate
	C. basic magnesium sulphide
	D. basic magnesium chloride

Ans: basic magnesium carbonate

Q19.	Which one of the following processes involve chemical reactions?
	A. Storing of oxygen gas under pressure in a gas cylinder
	B. Liquefaction of air
	C. Keeping petrol in a china dish in the open
	D. Heating copper wire in presence of air at high temperature

Ans: Heating copper wire in presence of air at high temperature

Q20.	Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is displacement reaction. Reason: Zinc reacts with oxygen to form zinc oxide.
	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.