CBSE Class 9 Science Chemical Reactions MCQs Set A

 CHEMICAL REACTIONS

1. The reaction CHEMICAL REACTIONS is a :

(A) Decomposition reaction

(B) Combination reaction

(C) Double displacement reaction

(D) Displacement reaction

 CBSE Class 9 Science Animal Tissues MCQs Set A-

7. Which of the following statements is incorrect?
(A) In oxidation, oxygen is added to a substance
(B) In reduction, hydrogen is added to a substance
(C) Oxidising agent is oxidized
(D) Reducing agent is oxidized
 
8. Which of the following is a combustion reaction?
(A) Boiling of water (B) Melting of wax
(C) Burning of petrol (D) None of these
 
9. Which of the 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
 
10. In the balanced equation aFe2O3 + bH2 → cFe + dH2O. The value of a, b, c, d are respectively :
(A) 1, 1, 2, 3 (B) 1, 1, 1, 1 (C) 1, 3, 2, 3 (D) 1, 2, 2, 3
 
CBSE Class 9 Science Animal Tissues MCQs Set A-1
12. The 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
 

13. Neutralization reaction is an example of :

(A) Exothermic reaction

(B) Endothermic reaction

(C) Oxidation reaction

(D) None of these

 

14. Which of the following statements is/are true?

(A) The total mass of the system remains same in a chemical change.

(B) A chemical change is permanent and irreversible.

(C) A physical change is temporary and reversible

(D) All of these

 

15. Which of the following statements is incorrect?

(A) In oxidation, oxygen is added to a substance

(B) In reduction, hydrogen is added to a substance

(C) Oxidising agent is oxidized

(D) Reducing agent is oxidized

 

16. Zn(s) + H2SO4(aq) —→ ZnSO4(aq) + H2(g) is an example of :
(A) Precipitation reaction (B) Endothermic reaction
(C) Evolution of gas (D) Change in colour

 

17. When dilute hydrochloric acid is added to iron fillings :
(A) Hydrogen gas and ferric chloride and produced
(B) Chlorine gas and ferric hydroxide and produced
(C) No reaction takes place
(D) Iron salt and water are produced

 

 CBSE Class 9 Science Animal Tissues MCQs Set A-2

 

CBSE Class 9 Science Animal Tissues MCQs Set A-3

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