Question

7. Write the chemical equation in words,

and then using chemical formulae, for the
chemical change that occurs when iron nails
are dipped in copper sulphate solution.

8.How can browning of the cut surfaces of
some fruits and vegetables be prevented?​

Answer 1

Fe(s)+CuSO4  ⟶Cu(s)+FeSO 4

Iron+ Copper sulphate ⟶ Copper + iron sulphate

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When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe2+  ions and ferrous sulphate solution is formed.

Answer 2

Answer:

iron + copper sulphate‐‐------------- copper + iron sulphate

when an iron nail is dipped in copper is formed on the surface of iron and the colour of copper sulphate solution changes from Blue to light green this reaction shows that the iron is more reactive than copper acid displaces copper from its solution and iron passes into solution as 32 + and ferrous sulphate solution is formed