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

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MCQ Questions for Class 10 Science with Answers Chemistry

Q1. 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

Q2. MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

(A) MnCl2
(B) HCl
(C) H2O
(D) MnO2

Q3. Dissolving sugar is an example of-

(A) Physical change
(B) Chemical change
(C) Redox Reaction
(D) None of these.

Q4. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

(A) 2H2(l) + O2(l) → 2H2O(g)
(B) 2H2(g) + O2(l) → 2H2O(l)
(C) 2H2(g) + O2(g) → 2H2O(l)
(D) 2H2(g) + O2(g) → 2H2O(g)

Q5. What type of chemical reactions take place when electricity is passed through water?

(A) Displacement
(B) Combination
(C) Decomposition
(D) Double displacement

Q6. When Ag is exposed to air it gets a black coating of

(A) AgNO3
(B) Ag2S
(C) Ag2O
(D) Ag2CO3

Q7. 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

Q8. 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

Q9. Magnesium ribbon is rubbed before burning because it has a coating of

(A) basic magnesium carbonate
(B) basic magnesium oxide
(C) basic magnesium sulphide
(D) basic magnesium chloride

Q10. 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

Q11. Which of the following is true for an unbalanced chemical equation?

(A) Number of atoms is equal on both sides of the equation
(B) Number of atoms is less on the left side of the equation
(C) Number of atoms is more on the right side of the equation
(D) Both (B) and (C) .

Q12. When Ag is exposed to air it gets a black coating of

(A) AgNO3
(B) Ag2S
(C) Ag2O
(D) Ag2CO3

Q13. 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

Q14. Select the oxidizing agent for the following reaction: H2S + I2 > 2HI + S

(A) I2
(B) H2S
(C) HI
(D) S

Q15. The process of reduction involves

(A) addition of oxygen
(B) addition of hydrogen
(C) removal of oxygen
(D) removal of hydrogen

Q16. Copper displaces which of the following metals from its salt solution:

(A) ZnSO4
(B) FeSO4
(C) AgNO3
(D) NiSO4

Q17. Oxidation is a process which involves