| 1 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
|
| 2 |
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
|
| 3 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
- A. Water
- B. Energy
- C. Glucoe
- D. CO2
|
| 4 |
Heating of solid potassium chlorate produces a gas. |
- A. Chlorine
- B. Carbon dioxide
- C. Carbon mono oxide
- D. Oxygen
|
| 5 |
Exothermic reaction ae those reactions durng which heat is. |
- A. Given out
- B. Remain same
- C. Absorbed
- D. Used
|
| 6 |
Thermal decompositionof calcium carbonate produces a gas. |
- A. Oxygen
- B. Carbon di oxide
- C. Nitrogen
- D. Carbon monoxide
|
| 7 |
Fire works is an example of ........... reactions. |
- A. Addition
- B. Exothermic
- C. Endothermic
- D. Decomposition
|
| 8 |
When methane is burnt in air, CO2 and.......... are formed. |
- A. O2
- B. H2O
- C. Glucose
- D. Energy
|
| 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
|
| 10 |
Law of conservation of mass put forward in. |
- A. 1783
- B. 1784
- C. 1785
- D. 1786
|