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CBSE Class 10 Science 2021 Term 1 Solved Paper

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It consists of three cases followed by questions. There are a total of 12 questions (Q. No. 49 to 60 ) in this section. Attempt any 10 questions from this section. The first attempted 10 questions would be evaluated. P-Did not react eiter 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 observation answer the following:
Case-I:
A student, took four metals P,Q,RP, Q, R, and S and carried out different experiments to study the properties of metals. Some of the observation were:
- All metal could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3\mathrm{M}_2\mathrm{O}_3 which reacted with both acids and bases.
- Reaction with water.
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Question : 49 of 60
Marks: +1, -0
Out of the given metals, the one which needs to be stored used Kerosene is:
Solution:  
Metal RR needs to be stored in kerosene oil because it reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, metal RR is kept immersed in kerosene because it does not react with kerosene.
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