| 1 |
Substancs whihc take part in a chemical reaction are called. |
- A. Products
- B. Ractants
- C. Elements
- D. Compunds
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| 2 |
When methane is burnt in air, CO2 and.......... are formed. |
- A. O2
- B. H2O
- C. Glucose
- D. Energy
|
| 3 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
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| 4 |
Law of conservation of mass put forward in. |
- A. 1783
- B. 1784
- C. 1785
- D. 1786
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| 5 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
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| 6 |
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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| 7 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
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| 8 |
Carbon burns in air to release energy along with the formation of. |
- A. Carbon dioxide and hydrogen
- B. Carbon monoxide and hydrogen
- C. Carbon di oxide
- D. Carbon dioixe and water
|
| 9 |
Law fo conservation of mass was put forward by |
- A. Newton
- B. Plank's
- C. Lavoisier
- D. Einstein
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| 10 |
The chemicla reaction during which a compound splits up into two or more simple substanes, is called. |
- A. Additon reaction
- B. Decomposition
- C. Replacement reaction
- D. Balanced reaction
|