Question

what you observed in the colour of iron nail and copper sulphate solution when the iron nail is dipped in the solution for 30 seconds​

Answer 1

Observation

The colour of Iron nails become brown due to the deposition of copper on iron nails. Furthermore, the colour of copper sulphate solution which is blue, disappears and the solution becomes green.

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This is because here, displacement reaction is carried out by iron nails and copper sulphate solution.

$\sf Fe + CuSO_4 \rightarrow FeSO_4 + Cu$

Fe (iron), being more reactive than Cu (copper), displaces it from its salt solution (CuSO4) and forms Iron sulphate solution, which is green in colour.

In displacement reaction, metals of higher reactivity displace metals of lower reactivity from their salt solutions

Answer 2

Answer:

displacement reaction..

Explanation:

when iron nail is placed in copper sulphate solution, the iron being more reactive than copper displaces it from the solution and the reaction is:

Fe + CuSO4 --> FeSO4 + Cu

the color of the solution turns green due to iron sulphate and a reddish brown layer on the nail (which is copper layer)

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