Q. 183.7( 3 Votes )

Complete the following reactions-

i. Cu + Al2(SO4)3

ii. Cu + CuSO4

iii. Zn + FeSO4

Answer :

i. Cu + Al2(SO4)3 No change observed
Explanation: Because copper (Cu) is less reactive than aluminium (Al), it cannot displace Al from its salt solution. Hence, no change observed.

ii. Cu + CuSO4 No change observed
Explanation: A metal cannot displace itself from its salt solution. Hence, no change is observed.

iii. Zn + FeSO4 Because Zn is more reactive than Iron (Fe), hence Zn displaces Fe from its salt solution. The original pale green solution FeSO4 becomes colourless.

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The least reactive metal among the following is:Lakhmir Singh & Manjit Kaur - Chemistry