| 1 |
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.
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| 2 |
A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is. |
- A. Iron oxide
- B. Iron sulphide
- C. Iron Chloride
- D. Iron Hydride
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| 3 |
Chemical reaction of oxygen with other substances is called. |
- A. Oxidation
- B. Reduction
- C. Rusting
- D. None of these
|
| 4 |
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
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| 5 |
Formation of steam from water is example of. |
- A. Chemical change
- B. Physical Change
- C. Both of these
- D. None of these
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| 6 |
Compustion is a. |
- A. Physical Change
- B. Chemical change
- C. Thermal change
- D. None of these
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| 7 |
Sajeet the one that is different from the otehrs. |
- A. Solubility
- B. Conductance
- C. Oxidation
- D. Coiling of a substance
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| 8 |
On heating sugar changes into |
- A. Carbon
- B. Water
- C. Both carbon and water
- D. Heat
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| 9 |
During combustion, a substance reacts with |
- A. Hydrogen
- B. Water
- C. Oxygen
- D. Carbon di oxide
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| 10 |
Rusting of iron takes place in the presence of. |
- A. Moisture
- B. O2
- C. Both moisture and O2
- D. Dry air
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