Q1 of 31 Page 46

Why sodium is kept immersed in kerosene oil?

Sodium is very reactive metal which react with the atmospheric moisture when kept in the open and produces fire as well. So, it is always kept immersed in kerosene oil to prevent its reaction with air and to prevent accidental fires.


More from this chapter

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1

Give an example of a metal which:

(i) is a liquid at room temperature


(ii) can be easily cut with a knife


(iii) is the best conductor of heat


(iv) is a poor conductor of heat

 2

Explain the meanings of malleable and ductile.

 2

Write equations for the reactions of:

(i) iron with steam


(ii) calcium with water


(iii) potassium with water

 3

Samples of four metals A, B, C and D were taken and added to the solutions given in the following table, one by one. The results obtained are as follows:






































Metal



Iron (II) sulphate



Copper (II) sulphate



Zinc sulphate



Silver nitrate



A



No reaction



Displacement





B



Displacement




No reaction




C



No reaction



No reaction



No reaction



Displace



D



No reaction



No reaction



No reaction



No reaction



Use the above table to answer the following questions about metals A, B, C and D:


(i) Which is the most reactive metal?


(ii) What would you observe when metal B is added to a solution of copper (II) sulphate?


(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.