Why is Sodium Kept Immersed in Kerosene Oil? - Science


Why is sodium kept immersed in kerosene oil?

give reason Sodium, potassium and lithium are stored under oil


Solution 1

Sodium is high reactive element. If it is kept in open it can explosively react with oxygen to catch fire. Hence to prevent accidental damage sodium is immersed in kerosene oil.

Solution 2

Sodium, potassium, and lithium are very reactive metals and react very vigorously with air as well as water.Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.

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Chapter 3: Metals and Non-metals - Intext Questions [Page 45]


NCERT Science Class 10
Chapter 3 Metals and Non-metals
Intext Questions | Q 1 | Page 45
Lakhmir Singh Class 10 Chemistry (Science)
Chapter 3 Metals and Non-metals
Exercise 1 | Q 51.1 | Page 134


.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen

A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green

Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.

_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

Name the following:
Metals which forms an amphoteric oxide.

Write equations for the reactions of iron with steam 

 Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Metal Iron (II) sulphate Cooper (II) sulphate Zinc sulphate Silver nitrate
A. No reaction Displacement    
B. Displacement   No reaction  
C. No reaction No reaction No reaction Displacement
D. No reaction No reaction No reaction No reaction

Use the Table above to answer the following questions about metals A, B, C and D.
(i) Which is the most reactive metal?
(ii) What would you observe if 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.

The solution of Aluminium sulphate in water is .....................

(a) Green

(b) Colourless

(c) Pink

(d) Blue

The reaction of an iron nail with copper sulphate solution is ........... reaction.

(a) Combination

(b) Displacement

(c) Double displacement

(d) Decomposition

A solution of _________________ in water is green in colour.

(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

From amongst the metals sodium, calcium aluminium, copper and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.

Which of the two metals is more reactive: copper or silver?

Write equation for the reaction of magnesium with oxygen.

Why does aluminium not react with water under ordinary conditions?

Name one metal which displaces copper from copper sulphate solution and one which does not.

The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead

A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.

Choose the correct alternative and rewrite the following:

Reaction of iron nails whith copper sulphate solution is an example of _____________________

Choose the correct alternative and rewrite the following:

Which of the following is lue in colour?

Calcium floats over water during the reaction with water. Give reason.  

Write the chemical equation of the above process.

Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.

Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example. 

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

  1. Good thermal conductivity
  2. Good electrical conductivity
  3. Ductility
  4.  High melting point

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

Which of the following property is not responsible for copper to be used as electrical conduction wires?

Find the odd one out:

Tungsten wire is used in electric bulbs.


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