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

Students are advised to practice the NCERT MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Pdf free download is available here. MCQ Questions for Class 10 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Chemical Reactions and Equations Class 10 MCQs Questions with Answers and assess their preparation level.


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

(a) 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.
(e) Both A and R are false.

(b) 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

(c) 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

(c) Rancidity


Q5. The following reaction is used for the preparation of oxygen gas in the laboratory:
MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers
Which of the following statement about the reaction is correct?

(a) It is a decomposition reaction and endothermic in nature.
(b) It is a combination reaction.
(c) It is a decomposition reaction and accompanied by release of heat.
(d) It is a photochemical decomposition reaction and exothermic in nature.

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


Q6. Which of the following is Not True with respect to the neutralisation reaction?

(a) Salt is formed.
(b) Reaction occurs between an acid and a base.
(c) Reactive element displaces less reactive element.
(d) Reactants are in gaseous state.

(d) Reactants are in gaseous state.


Q7. 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

(b) 2 : 1


Q8. 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

(a) 4


Q9. Copper displaces which of the following metals from its salt solution:

(a) ZnSO4
(b) FeSO4
(c) AgNO3
(d) NiSO4

(c) AgNO3


Q10. 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.

(b) White precipitate of silver iodide is formed


Q11. 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

(b) 2Ag + Cu(NO3)2 ? 2AgNO3 + Cu


Q12. 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

(b) it loses water of crystallisation


Q13. 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

(a) Positive change


Q14. Pb + CuCl2 ? PbCl2 + Cu
This reaction is an example of:

(a) combination
(b) displacement
(c) decomposition
(d) double displacement

(b) displacement


Q15. 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

(b) reducing agent


Q16. 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

(d) Helium or Nitrogen


Q17. 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

(a) 1:2


Q18. The process of reduction involves

(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen

(a) addition of oxygen


Q19. Oxidation is a process which involves

(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen

(a) addition of oxygen


Q20. 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

(b) Ca (OH)2


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