Here are some multiple-choice questions (MCQs) for CBSE Chapter 1 Class 10 Science Chemical Reactions and Equations. These MCQs are designed to help students become familiar with the question types and their difficulty levels according to the updated CBSE Syllabus. With the recent changes in the exam pattern, MCQs have become an important part of the Class 10 Science Board exam. To assist students in understanding these question types, we have compiled MCQs specifically for Chapter 1 to make fundamentals strong. Additionally, answers to these MCQs are also available for students to reference. These MCQs are available in PDF format for download, enabling students to access them at any time during their studies. Students can also use the CBSE Class 10 Sample Papers books for more practice.
Important – CBSE Class 10 Science MCQ
CBSE Class 10 Chemical Reactions and Equations MCQs
Q.1. Among the following, the endothermic reaction is
(a) combination of carbon and oxygen to form carbon monoxide
(b) combination of nitrogen and oxygen to form nitrogen monoxide
(c) combination of glucose and oxygen to form carbon dioxide and water
(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen.
Answer
Practice More – CBSE Practice Papers Class 10 (2024) – Free PDF Download
Q.2. Formation of carbon disulphide from carbon and sulphur takes place by
(a) absorption of heat
(b) evolution of heat
(c) no change in heat content
(d) none of the above.
Answer
C + 2S → CS2 It is an endothermic reaction, resulting in absorption of heat.
Q.3. Identify X, Y, and the type of reaction occurring.
(a) H2, O2, Decomposition
(b) O2, H2, Displacement
(c) H2, O2, Displacement
(d) O2, H2, Decomposition
Answer
(d)
The given diagram shows electrolysis of water which is a type of decomposition reaction. When electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gases. 2H2O(l)Electricity → 2H2(g)(2 volumes) O2(g)(1 volumes) electricity Since in the above reaction, 2 volumes of H2 gas and 1 volume of O2 gas are produced hence, Y is H2 gas and X is O2 gas
Also Check – CBSE Sample Papers Class 10 for 2024 Board Exams
Q.4. Copper displaces which of the following metal from its salt solution
(a) ZnSO4 (b) FeSO4
(c) AgNO3 (d) NiSO4
Answer
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag Copper can displace silver from its salt solution since copper is more reactive than silver.
Q.5. The chemical reaction involved in the corrosion of metal is that of
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement.
Answer
Q.6. Which of the following is not an example of decomposition reaction?
(a) CaCO3(s) → CaO(s) + CO2(g)
(b) Ca(OH)2(s) → CaO(s) + H2O(l)
(c) CuSO4.5H2O(s) → CuSO4(s) + 5H2O(l)
(d) 2KClO3(s) → 2KCl(s) + 3O2(g)
Answer
In all other reactions except (c) the compound decomposes to give simpler products while in (c) only the water of crystallisation is separated from the compound.
Q.7. In the balanced equation, Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O the values of x and y are
(a) 3 and 5 (b) 8 and 6
(c) 4 and 2 (d) 7 and 1
Answer
Cu + 4HNO3 → Cu(NO3) 2 + 2NO2 + 2H2O
Q.8. Which of the following statements about the following reactions is correct?
ZnO + CO → Zn + CO2
(a) ZnO is being oxidized.
(b) CO is being reduced.
(c) CO2 is being oxidized.
(d) ZnO is being reduced.
Answer
ZnO is reduced to Zn and CO is oxidised to CO2
CBSE Class 10 Resources – Important Formula Book For 10th Science
Q.9. In the reaction between lead sulphide and hydrogen peroxide which substance is reduced?
PbS + 4H2O2 → PbSO4 + 4H2O
(a) Lead sulphide (b) Hydrogen peroxide
(c) Lead sulphate (d) Water
Answer
H2O2 is reduced to water by removal of oxygen
Q.10. Which of the following reactions is used in white washing walls?
(a) 2Ca + O2 → 2CaO
(b) Ca(OH)2 Heat → CaO + H2O
(c) Ca(OH)2 + CO2 → CaCO3 + H2O
(d) CaO + H2O → Ca(OH)2
Answer
Lime is mixed with water to give slaked lime and applied on the walls. When slaked lime or Ca(OH)2 absorbs CO2 from the atmosphere it forms a shining white substance lime stone which gives shining white colour to the walls. Ca(OH)2 + CO2 → CaCO3 ↓ + H2O
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