Time Left:
600
sec
1. Which of the following is a sign of a chemical reaction?
A. Change in shape
B. Change in colour
C. Melting of ice
D. Breaking glass
2. What is formed when magnesium ribbon burns in air?
A. Magnesium chloride
B. Magnesium sulphate
C. Magnesium oxide
D. Magnesium carbonate
3. Which side of a chemical equation shows the products?
A. Left-hand side
B. Right-hand side
C. Both sides
D. Above the arrow
4. The equation Mg + O₂ → MgO is an example of:
A. Balanced equation
B. Skeletal equation
C. Endothermic equation
D. Double displacement equation
5. Which law is followed while balancing a chemical equation?
A. Law of gravitation
B. Law of conservation of mass
C. Law of constant proportion
D. Law of motion
6. The reaction Zn + H₂SO₄ → ZnSO₄ + H₂ is:
A. Unbalanced equation
B. Skeletal equation
C. Balanced equation
D. Combination equation
7. In the equation Fe + H₂O → Fe₃O₄ + H₂, which element is first balanced?
A. Hydrogen
B. Iron
C. Oxygen
D. Sulphur
8. What notation is used for aqueous solution in chemical equations?
A. (l)
B. (s)
C. (g)
D. (aq)
9. What is the product of CaO + H₂O?
A. CaCl₂
B. Ca(OH)₂
C. CaCO₃
D. CaSO₄
10. The reaction CaO + H₂O → Ca(OH)₂ is an example of:
A. Combination reaction
B. Decomposition reaction
C. Displacement reaction
D. Double displacement reaction
11. The reaction in which heat is released along with products is called:
A. Endothermic reaction
B. Exothermic reaction
C. Photochemical reaction
D. Electrolytic reaction
12. Respiration is an example of:
A. Endothermic process
B. Exothermic process
C. Neutralisation process
D. Decomposition process
13. The reaction Ca(OH)₂ + CO₂ → CaCO₃ + H₂O is used in:
A. Fertilisation
B. Whitewashing
C. Glass making
D. Combustion
14. The reaction CaCO₃ → CaO + CO₂ is an example of:
A. Combination reaction
B. Thermal decomposition
C. Double displacement
D. Neutralisation
15. The reaction 2AgCl → 2Ag + Cl₂ in sunlight is:
A. Combination reaction
B. Electrolytic decomposition
C. Photochemical decomposition
D. Thermal decomposition
16. The reaction 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂ is:
A. Thermal decomposition
B. Combination reaction
C. Displacement reaction
D. Neutralisation
17. In electrolysis of water, why is the volume of hydrogen double that of oxygen?
A. Oxygen is heavier
B. Hydrogen is diatomic
C. Water has two hydrogen atoms and one oxygen atom
D. Oxygen dissolves in water
18. Which reaction produces brown fumes of nitrogen dioxide?
A. Heating silver chloride
B. Heating lead nitrate
C. Heating ferrous sulphate
D. Decomposition of CaCO₃
19. Which reaction produces ferric oxide, SO₂ and SO₃?
A. Heating CaCO₃
B. Heating Pb(NO₃)₂
C. Heating FeSO₄
D. Heating AgCl
20. Decomposition reactions require energy in the form of:
A. Heat, light or electricity
B. Only heat
C. Only light
D. Only electricity
Submit Test