
Give reason:
Metals like sodium and potassium are stored under oil.
Important Questions on Metals and Non-metals


A student, took four metal P, Q, R and S and earned out different experiments to study the properties of metals. Some of the observations were:
- All metals could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide which reacted with both acids and bases.
- Reaction with water.
P ā Did not react either with cold or hot water but reacted with steam
Q ā Reacted with hot water and the metal started floating
R ā Reacted violently with cold water.
S ā Did not react with water at all.
Based on the above observations answer the following:
Out of the given metals, the one which needs to be stored used kerosene is-

A student, took four metal P, Q, R and S and earned out different experiments to study the properties of metals. Some of the observations were:
- All metals could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide which reacted with both acids and bases.
- Reaction with water.
P ā Did not react either with cold or hot water but reacted with steam
Q ā Reacted with hot water and the metal started floating
R ā Reacted violently with cold water.
S ā Did not react with water at all.
Based on the above observations answer the following:
Out of the given metals, the metal Q is:

A student, took four metal P, Q, R and S and earned out different experiments to study the properties of metals. Some of the observations were:
- All metals could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide which reacted with both acids and bases.
- Reaction with water.
P ā Did not react either with cold or hot water but reacted with steam
Q ā Reacted with hot water and the metal started floating
R ā Reacted violently with cold water.
S ā Did not react with water at all.
Based on the above observations answer the following:
Metal which forms amphoteric oxides is:

A student, took four metal P, Q, R and S and earned out different experiments to study the properties of metals. Some of the observations were:
- All metals could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide which reacted with both acids and bases.
- Reaction with water.
P ā Did not react either with cold or hot water but reacted with steam
Q ā Reacted with hot water and the metal started floating
R ā Reacted violently with cold water.
S ā Did not react with water at all.
Based on the above observations answer the following:
The increasing order of the reactivity of four metals is:


Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
