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A student placed a clean iron nail in bl...

A student placed a clean iron nail in blue coloured copper sulphate solution for a considerable time. He observes that :

A

iron nail gets green coating

B

iron nail gets brown coating

C

iron nail gets no coating

D

iron nail gets blue coating

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The correct Answer is:
B
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What happens when iron nails are put into copper sulphate solution?

On keeping iron nails in a blue coloured copper sulphate solution, it is observed that the colour of the solution turns light green after sometime. Give reasons for this colour change. Name the type of reaction.

A students is performing displacement reactions of metals with salt solutions. (a) In first case, the student keeps a strip of copper metal in iron (II) sulphate for a considerable time (b) In second case, the student keeps a strip of zinc metal in copper (II) sulphate solution for a consider time (i) In which case the displacement reaction will take place ? why ? (ii) In which case the displacement reaction will not take place? Why not ?

The reaction of iron nail with copper sulphate solution is ………….. Reaction.

LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
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  2. A student was asked by her science teacher to prepare a true solution....

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  3. A student placed a clean iron nail in blue coloured copper sulphate so...

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  4. When a student added a few drops of barium chloride solution to sodium...

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  5. A student was asked to carry out a chemical reaction by placing four d...

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  6. We can show that is more reactive than copper :

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  7. A student sets up an apparatus to determine to melting point of ice. H...

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  8. What are canal rays?

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  9. If an atom contains one electron and one proton, will it carry any cha...

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  10. On the basis of Thomson’s model of an atom, explain how the atom is ne...

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  11. On the basis of Rutherford’s model of an atom, which sub- atomic parti...

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  12. Draw a sketch of Bohr’s model of an atom with three shells.

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  13. What do you think would be the observation if the alpha-particle scatt...

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  14. Name the three sub-atomic particles of an atom.

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  15. Helium atom has an atomic mass of 4u and two protons in its nucleus. H...

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  16. If K and L shells of an atom are full, then what would be the total nu...

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  17. How will you find the valency of chlorine, sulphur and magnesium ?

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  18. If number of electrons in an atom is 8 and number of protons is also 8...

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  19. With the help of Table given below, find out the mass numbers of oxyge...

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  20. For the symbol H,D and T tabulate three sub-atomic particles found in ...

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