| 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.
|
| 2 |
On heating sugar changes into |
- A. Carbon
- B. Water
- C. Both carbon and water
- D. Heat
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| 3 |
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
|
| 4 |
Compustion is a. |
- A. Physical Change
- B. Chemical change
- C. Thermal change
- D. None of these
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| 5 |
A physical change occurs when. |
- A. Iron rusts
- B. Solution of common salt is heated
- C. A piece of wood burns
- D. Sygar us geated strongly
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| 6 |
During combustion, a substance reacts with |
- A. Hydrogen
- B. Water
- C. Oxygen
- D. Carbon di oxide
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| 7 |
A gas produced on heating solid potassium chlorate is. |
- A. Hydrogen
- B. Carbon dioxide
- C. Oxygen
- D. Methane
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| 8 |
Original colur or Nichrome wire is. |
- A. Silver grey
- B. Red hot
- C. White hot
- D. None of these
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| 9 |
Sajeet the one that is different from the otehrs. |
- A. Solubility
- B. Conductance
- C. Oxidation
- D. Coiling of a substance
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| 10 |
Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as. |
- A. Combustion
- B. Rusting
- C. Tarmishing
- D. Dehydration
|
