| 1 |
Chemical reaction of oxygen with other substances is called. |
Oxidation
Reduction
Rusting
None of these
|
| 2 |
Rusting of iron takes place in the presence of. |
Moisture
O2
Both moisture and O2
Dry air
|
| 3 |
Product fo combustion is. |
C
O2
CO2
All of these
|
| 4 |
Compustion is a. |
Physical Change
Chemical change
Thermal change
None of these
|
| 5 |
Original colur or Nichrome wire is. |
Silver grey
Red hot
White hot
None of these
|
| 6 |
Zince oxide is ............... solid substances. |
Red
White
Yellow
Blue
|
| 7 |
Formation of steam from water is example of. |
Chemical change
Physical Change
Both of these
None of these
|
| 8 |
What happens to water on heating. |
Evaporates
Condense
Freez
None of these
|
| 9 |
Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as. |
Combustion
Rusting
Tarmishing
Dehydration
|
| 10 |
The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is. |
Melting point
Boiling point
Freezing point
Highest temperature.
|
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