Question

iron metal is placed in blue coloured copper nitrate solution what will you observe after 1 hours​

Answer 1

iron metal placed in copper nitrate displacement reaction takes place as zn is more reactive than cu. zn replaces cu from copper nitrate and a greenish layer will form over the iron metal

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Answer 2

after one hour we would observe that the blue color of the solution has disappeared due to formation of Fe(NO3)2. this product has been formed due to displacement of Cu from it's salt solution by Fe and in the bottom of the beaker deposition of copper can be seen.

the reaction involved is
Fe(s) + Cu(NO3)2(aq) --------> Cu(s) + Fe(NO3)2 (aq)
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