Science
A student, took four metals P, Q, R and S and carried out different experiments to study the properties of metals. Some of the observations were :
- All metals could not be cut with a knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.
- P – Did not react either with cold or hot water but reacted with steam
- Q – Reacted with hot water and the metal started floating
- R – Reacted violently with cold water.
- S – 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 under Kerosene is
- P
- R
- S
- Q
Metals & Non-Metals
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Answer
R
Reason — R reacts vigorously and catches fire when kept in open, hence it needs to be stored in kerosene oil. Example : sodium and potassium
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Related Questions
An object of height 4 cm is kept at a distance of 30 cm from the pole of a diverging mirror. If the focal length of the mirror is 10 cm, the height of the image formed is
- +3.0 cm
- +2.5 cm
- +1.0 cm
- +0.75 cm
50.0 mL of tap water was taken in a beaker. Hydrochloric acid was added drop by drop to water. The temperature and pH of the solution was noted. The following graph was obtained. Choose the correct statements related to this activity.
(i) The process of dissolving an acid in water is highly endothermic.
(ii) The pH of the solution increases rapidly on addition of acid.
(iii) The pH of the solution decreases rapidly on addition of acid.
(iv) The pH of tap water was around 7.0.
- (i) and (ii)
- (i) and (iii)
- (iii) and (iv)
- (ii) and (iv)
A student, took four metals P, Q, R and S and carried out different experiments to study the properties of metals. Some of the observations were :
- All metals could not be cut with a knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.
- P – Did not react either with cold or hot water but reacted with steam
- Q – Reacted with hot water and the metal started floating
- R – Reacted violently with cold water.
- S – Did not react with water at all
Based on the above observations answer the following:
Out of the given metals, the metal Q is
- Iron
- Zinc
- Potassium
- Magnesium
A student, took four metals P, Q, R and S and carried out different experiments to study the properties of metals. Some of the observations were :
- All metals could not be cut with a knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.
- P – Did not react either with cold or hot water but reacted with steam
- Q – Reacted with hot water and the metal started floating
- R – Reacted violently with cold water.
- S – Did not react with water at all
Based on the above observations answer the following:
Metal which forms amphoteric oxides is
- P
- Q
- R
- S