| 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 |
Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as. |
- A. Combustion
- B. Rusting
- C. Tarmishing
- D. Dehydration
|
| 3 |
Chemical reaction of oxygen with other substances is called. |
- A. Oxidation
- B. Reduction
- C. Rusting
- D. None of these
|
| 4 |
Freezing of a liquid is a |
- A. Chemical change
- B. Chemicla property
- C. Physical change
- D. None of these
|
| 5 |
Sajeet the one that is different from the otehrs. |
- A. Solubility
- B. Conductance
- C. Oxidation
- D. Coiling of a substance
|
| 6 |
Product fo combustion is. |
- A. C
- B. O2
- C. CO2
- D. All of these
|
| 7 |
Formation of steam from water is example of. |
- A. Chemical change
- B. Physical Change
- C. Both of these
- D. None of these
|
| 8 |
Compustion is a. |
- A. Physical Change
- B. Chemical change
- C. Thermal change
- D. None of these
|
| 9 |
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
|
| 10 |
What happens to water on heating. |
- A. Evaporates
- B. Condense
- C. Freez
- D. None of these
|
