| 1 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
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| 2 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
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| 3 |
Symbol and formulae of the reactants are written on....... side fo arrow. |
- A. Left
- B. Right
- C. Upward
- D. Both side
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| 4 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
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| 5 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
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| 6 |
Law fo conservation of mass was put forward by |
- A. Newton
- B. Plank's
- C. Lavoisier
- D. Einstein
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| 7 |
The reaction between calcium oxide and carbon dioxide to form calcium carbonate is an example of. |
- A. Decomposition reaction
- B. Addition reaction
- C. Acid-Base reaction
- D. Neutralizaion reaction
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| 8 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
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| 9 |
The product fo the reaction between zinc and dilute sulphuric acid are. |
- A. Zinc oxide and water
- B. Zinc sulphide and water
- C. Zinc sulphate and hydrogen
- D. Zinc sulphide and hydrogen
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| 10 |
Substancs whihc take part in a chemical reaction are called. |
- A. Products
- B. Ractants
- C. Elements
- D. Compunds
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