| 1 |
What are teh products when electric current is passed through water. |
- A. Only steam
- B. Hydrogen and steam
- C. Hydrogen and oxygen
- D. Oxygen and steam
|
| 2 |
Zince oxide is ............... solid substances. |
- A. Red
- B. White
- C. Yellow
- D. Blue
|
| 3 |
What happens to water on heating. |
- A. Evaporates
- B. Condense
- C. Freez
- D. None of these
|
| 4 |
On heating sugar changes into |
- A. Carbon
- B. Water
- C. Both carbon and water
- D. Heat
|
| 5 |
Select all that happen during a chemicla change. |
- A. A temporary chagne occurs.
- B. Composition of the substanes is changed.
- C. Propertis of the sbstances are changed.
- D. New substances with different properties are formed.
|
| 6 |
Sajeet the one that is different from the otehrs. |
- A. Solubility
- B. Conductance
- C. Oxidation
- D. Coiling of a substance
|
| 7 |
Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as. |
- A. Combustion
- B. Rusting
- C. Tarmishing
- D. Dehydration
|
| 8 |
Rusting of iron takes place in the presence of. |
- A. Moisture
- B. O2
- C. Both moisture and O2
- D. Dry air
|
| 9 |
Original colur or Nichrome wire is. |
- A. Silver grey
- B. Red hot
- C. White hot
- D. None of these
|
| 10 |
A gas produced on heating solid potassium chlorate is. |
- A. Hydrogen
- B. Carbon dioxide
- C. Oxygen
- D. Methane
|
