| 1 |
The equation in which the number of atoms of each element on both sides are not equal is called. |
Quadratic equation
Unbalanced equation
Balanced equation
Standard equation
|
| 2 |
Symbol and formulae of the reactants are written on....... side fo arrow. |
Left
Right
Upward
Both side
|
| 3 |
During photosynthesis in plants, carbon dioxide CO2 and water react to produce. |
Water
Energy
Glucoe
CO2
|
| 4 |
When methane is burnt in air, CO2 and.......... are formed. |
O2
H2O
Glucose
Energy
|
| 5 |
Substancs whihc take part in a chemical reaction are called. |
Products
Ractants
Elements
Compunds
|
| 6 |
Thermal decompositionof calcium carbonate produces a gas. |
Oxygen
Carbon di oxide
Nitrogen
Carbon monoxide
|
| 7 |
The reaction between calcium oxide and carbon dioxide to form calcium carbonate is an example of. |
Decomposition reaction
Addition reaction
Acid-Base reaction
Neutralizaion reaction
|
| 8 |
How many oxygen atoms are present in onw molecule of Mg(HCO3)2 |
2
4
6
8
|
| 9 |
Heating of solid potassium chlorate produces a gas. |
Chlorine
Carbon dioxide
Carbon mono oxide
Oxygen
|
| 10 |
The product fo the reaction between zinc and dilute sulphuric acid are. |
Zinc oxide and water
Zinc sulphide and water
Zinc sulphate and hydrogen
Zinc sulphide and hydrogen
|
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