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- 1. Multiple Choice
1. Before burning in air, the Magnesium ribbon is cleaned by rubbing with a sand paper to:
a. Make the ribbon surface shinier
b. Remove the layer of Magnesium oxide from the ribbon surface
c. Remove the layer of Magnesium carbonate from the ribbon surface
d. Remove the moisture from the ribbon surface
- 2. Multiple Choice
In a chemical reaction between Sulphuric acid and Barium chloride solution the white precipitates formed are of:
a. Hydrochloric acid
b. Barium sulphate
c. Chlorine
d. Sulphur
- 3. Multiple Choice
3. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy is a kind of:
a. Exothermic process
b. Endothermic process
c. Reversible process
d. Physical process
- 4. Multiple Choice
4. It is necessary to balance a chemical equation in order to satisfy the law of:
a. Conservation of motion
b. Conservation of momentum
c. Conservation of energy
d. Conservation of mass
- 5. Multiple Choice
5. The process of breakdown of water into its components using electricity is:
a. Distillation of water
b. Purification of water
c. Electrolysis of water
d. Hydrolysis
- 6. Multiple Choice
6. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:
a. Blue to green.
b. Green to blue.
c. Green to brown.
d. Green to yellow.
- 7. Multiple Choice
7. The neutralization reaction between an acid and a base is a type of:
a. Double displacement reaction
b. Displacement reaction
c. Addition reaction
d. Decomposition reaction
- 8. Multiple Choice
8. You are given the following chemical reaction:
This reaction represents:
CuO + H2 ----------> Cu + H2O
a. Combination reaction as well as double displacement reaction
b. Redox reaction as well as displacement reaction
c. Double displacement reaction as well as Redox reaction
d. Decomposition reaction as well as displacement reaction
- 9. Open Ended
9. What do you mean by Corrosion? Write steps to prevent corrosion.
- 10. Open Ended
10. What is Rancidity? Write steps to prevent rancidity.
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