| 1 |
During combustion, a substance reacts with |
Hydrogen
Water
Oxygen
Carbon di oxide
|
| 2 |
A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is. |
Iron oxide
Iron sulphide
Iron Chloride
Iron Hydride
|
| 3 |
What are teh products when electric current is passed through water. |
Only steam
Hydrogen and steam
Hydrogen and oxygen
Oxygen and steam
|
| 4 |
Freezing of a liquid is a |
Chemical change
Chemicla property
Physical change
None of these
|
| 5 |
Select all that happen during a chemicla change. |
A temporary chagne occurs.
Composition of the substanes is changed.
Propertis of the sbstances are changed.
New substances with different properties are formed.
|
| 6 |
A gas produced on heating solid potassium chlorate is. |
Hydrogen
Carbon dioxide
Oxygen
Methane
|
| 7 |
A physical change occurs when. |
Iron rusts
Solution of common salt is heated
A piece of wood burns
Sygar us geated strongly
|
| 8 |
Sajeet the one that is different from the otehrs. |
Solubility
Conductance
Oxidation
Coiling of a substance
|
| 9 |
The elements of group 18 are called. |
Alkali metals
Noble gases
Alkaline metals
Transition metals
|
| 10 |
There are ............ groups in periodic table. |
2
8
18
32
|
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