| 1 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
|
| 2 |
When methane is burnt in air, CO2 and.......... are formed. |
- A. O2
- B. H2O
- C. Glucose
- D. Energy
|
| 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
|
| 4 |
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
|
| 5 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
|
| 6 |
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
|
| 7 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
|
| 8 |
Substancs whihc take part in a chemical reaction are called. |
- A. Products
- B. Ractants
- C. Elements
- D. Compunds
|
| 9 |
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
|
| 10 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
|