| 1 |
Exothermic reaction ae those reactions durng which heat is. |
- A. Given out
- B. Remain same
- C. Absorbed
- D. Used
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| 2 |
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
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| 3 |
During a chemical reaction, total mass of the product is equal to the total mass of reactants, this is a statements of. |
- A. Law of conservation of momentum
- B. Law of conservation of energy
- C. Law of conseration of mass
- D. Law of conseration of acceleration
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| 4 |
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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| 5 |
When methane is burnt in air, CO2 and.......... are formed. |
- A. O2
- B. H2O
- C. Glucose
- D. Energy
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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 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
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| 8 |
Law of conservation of mass put forward in. |
- A. 1783
- B. 1784
- C. 1785
- D. 1786
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| 9 |
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
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| 10 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
|