Question

While demonstrating an experiment in a laboratory, Ritika added few pieces of iron ton
aqueous solution of copper sulphate. She found that, the blue colored solution slowly changed
its colour to pale green and there was a deposition of red substance at the base of the beaker
2.
How did the solution turn pale green in color?
(a) The pale green colouration is due to formation of copper.
(b) The pale green colouration is due to formation of copper oxide.
(c) The pale green colouration is due to formation of ferrous sulphate.
(d) The pale green colouration is due to formation of copper chloride
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Answer 1

Answer:

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

so options a) The pale green colouration is due to formation of copper.

reason : The copper patina colour has been systematically explored through a large set of short- and long-term exposed copper metal samples. ... The characteristic green-blue appearance is due to the colour forming Cu(II)-ion in the outer patina layer which needs to be 12 ± 2 μm to fully cover the inner cuprite layer.

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Answer 2

Answer:

Option d is the correct answer