Question

Dip an iron nail in salt solution. What change do you observe?​

Answer 1

Answer:

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green.

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Answer 2

When an iron nail is dipped in salt solution, following changes are observed:

• A coating of metal over the surface of the iron nail.
• Change in the colour of salt solution.

Explanation:

When an iron nail is dipped in salt solution, say Copper sulphate

• Iron can easily displace copper from copper sulphate solution being lower in metal activity series.
• Therefore, Brown coating of copper occurs over the surface of iron nail.
• The colour of the solution changes to pale green (iron sulphate) from blue (copper sulphate).

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