| 1 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
|
| 2 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
|
| 3 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
|
| 4 |
Exothermic reaction ae those reactions durng which heat is. |
- A. Given out
- B. Remain same
- C. Absorbed
- D. Used
|
| 5 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
|
| 6 |
Law fo conservation of mass was put forward by |
- A. Newton
- B. Plank's
- C. Lavoisier
- D. Einstein
|
| 7 |
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
|
| 8 |
Substancs whihc take part in a chemical reaction are called. |
- A. Products
- B. Ractants
- C. Elements
- D. Compunds
|
| 9 |
Symbol and formulae of the reactants are written on....... side fo arrow. |
- A. Left
- B. Right
- C. Upward
- D. Both side
|
| 10 |
When methane is burnt in air, CO2 and.......... are formed. |
- A. O2
- B. H2O
- C. Glucose
- D. Energy
|