Time Left:
600
sec
1. Burning of coal is an example of:
A. Decomposition reaction
B. Combination reaction
C. Double displacement reaction
D. Neutralisation reaction
2. Photosynthesis is an example of:
A. Double displacement reaction
B. Combination reaction
C. Endothermic reaction
D. Exothermic reaction
3. The reaction CH₄ + 2O₂ → CO₂ + 2H₂O is:
A. Exothermic reaction
B. Endothermic reaction
C. Combination reaction
D. Double displacement
4. The reaction 2H₂ + O₂ → 2H₂O is:
A. Displacement reaction
B. Combination reaction
C. Decomposition reaction
D. Double displacement reaction
5. Which equation represents photosynthesis?
A. CO + O₂ → CO₂
B. C₆H₁₂O₆ + O₂ → CO₂ + H₂O
C. 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂
D. Zn + CuSO₄ → ZnSO₄ + Cu
6. Which method is commonly used to balance equations?
A. Algebraic method
B. Hit-and-trial method
C. Oxidation method
D. Ion method
7. Which of the following indicates physical state of gases?
A. (s)
B. (l)
C. (g)
D. (aq)
8. Which of the following is an aqueous solution?
A. CaO(s)
B. H₂O(l)
C. NaCl(aq)
D. CO₂(g)
9. Which reaction is used in black and white photography?
A. Thermal decomposition
B. Photochemical decomposition of AgCl or AgBr
C. Neutralisation
D. Displacement
10. Which of the following is reduced in CuO + H₂ → Cu + H₂O?
A. H₂
B. CuO
C. O₂
D. H₂O
11. What type of reaction occurs in Fe + CuSO₄ → FeSO₄ + Cu?
A. Combination
B. Displacement
C. Double displacement
D. Decomposition
12. Which reaction is exothermic?
A. CaO + H₂O → Ca(OH)₂
B. Photosynthesis
C. Electrolysis of water
D. Heating of CaCO₃
13. Which term is used for the black coating on silver?
A. Rancidity
B. Corrosion
C. Reduction
D. Oxidation
14. Why are equations balanced?
A. To satisfy law of gravitation
B. To equalise molecules
C. To satisfy law of conservation of mass
D. To form products
15. Which of the following prevents rancidity of food?
A. Exposure to air
B. Adding antioxidants
C. Storing in sunlight
D. Heating oils
Submit Test