| 1 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
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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 |
Exothermic reaction ae those reactions durng which heat is. |
- A. Given out
- B. Remain same
- C. Absorbed
- D. Used
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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 |
Substancs whihc take part in a chemical reaction are called. |
- A. Products
- B. Ractants
- C. Elements
- D. Compunds
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| 6 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
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| 7 |
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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| 8 |
Law fo conservation of mass was put forward by |
- A. Newton
- B. Plank's
- C. Lavoisier
- D. Einstein
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| 9 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
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| 10 |
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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