| 1 |
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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| 2 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
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| 3 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
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| 4 |
Law fo conservation of mass was put forward by |
- A. Newton
- B. Plank's
- C. Lavoisier
- D. Einstein
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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 |
Exothermic reaction ae those reactions durng which heat is. |
- A. Given out
- B. Remain same
- C. Absorbed
- D. Used
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| 7 |
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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| 8 |
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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| 9 |
The equation in which the number of atoms of each element on both sides are not equal is called. |
- A. Quadratic equation
- B. Unbalanced equation
- C. Balanced equation
- D. Standard equation
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| 10 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
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