General Knowledge - Chemistry - Discussion

Discussion :: Chemistry - Section 1 (Q.No.4)


The metal used to recover copper from a solution of copper sulphate is

[A]. Na
[B]. Ag
[C]. Hg
[D]. Fe

Answer: Option D


No answer description available for this question.

Venu Gopal said: (Dec 6, 2010)  
May I know its mechanism.

Anjali Soni said: (Dec 16, 2010)  
Fe recover copper becoz the iron lyes below in the electromegnatic table

Mansi said: (Mar 9, 2011)  
Please give me electro magnetic table.

Amita said: (Apr 19, 2011)  
Please clearify the answer. Copper doesnt come under magnatic property.

Ram said: (May 8, 2011)  
Ag stands for silver
So it can also be used no?

Srishti said: (Jun 4, 2011)  
Is it electromagnetic table or the electrochemical series?

Seema Agrawal said: (Jun 4, 2011)  
Can't amalgam be formed in case of Hg?

Jehangir said: (Jun 29, 2011)  
Copper and iron both has great affinity for sulphate ions. So if we use iron as electrode. It will give e. And these will be accepted by cup ion and will deposit at cathode. So cu will deposit. And iron will disolve. So contration same.

Prams said: (Aug 30, 2011)  
Thank you for your valuable info Jehangir.

Tushar said: (Oct 4, 2011)  
The chemical reaction of changing iron and copper sulphate to form iron sulphate and copper :

Fe + CuSO4 → FeSO4 + Cu

Navneet Singh said: (Feb 27, 2012)  
Because Fe have more reactivity then Cu, accordingly to electrochemical series. and also Fe have more reducing power than Cu. hence iron can be use to recover copper from their solution.
if we see the "electrochemical series" we found that.......

Li > K > Sr > Ca > Na > Mg > Al > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Cu > Ag > Hg > Pt > Au, our ans.

Claire said: (Apr 14, 2012)  
What is needed is a substance that can displace copper hence any substance more reactive than copper will work i.e an [aq] solution of sodium

Resmy said: (Apr 25, 2012)  
Thanks for your answer Navneeth.Fe is more reactive than copper so it reduces CuSO4 to copper .

Dolly said: (May 24, 2012)  
Fe and Na both are above Cu in electro chemical series. Then why doesnt Na replace copper from its own solution?

Haseeb Ahmed said: (Jun 7, 2012)  
Since standard electrode reduction potential of iron is -0.44v and for copper is +0.344v, iron act as an reducing agent i.e. (easily oxidized and produces 2 electrons) while copper act as an oxidizing agent I. E (easily reduced by gaining electrons).

Remember one thing: higher the negative value of standard electrode potential, easily the oxidation take place of that element or vice versa.

Jay said: (Jul 21, 2012)  
Dolly in a mechanism iron easily produce 2e- and copper easily gain 2e-. And sodium produce only one electron so mechanism not set so iron is right answer.

Premkumar said: (Aug 7, 2012)  
cuso4+Fe=Feso4+cu This is chemical reaction. cu give 2+ electron and so4 accept this electron.

Nitin Salvi said: (Nov 20, 2012)  
Fe is high reactive than cu.

Kareena said: (Dec 25, 2012)  
According to activity series, iron is more reactive then copper hence iron will displace copper from its aqueous solution.

Preeti said: (Feb 1, 2013)  
Its because iron displaces copper sulphate as iron is more reactive metal than copper.

Lenhkp said: (Mar 18, 2013)  
Its a simple case of displacement reaction where, Fe being more reactive in the activity series of metal, replaces Cu from the CuSO4 solution to liberate free Cu.

Fe (more reactive) +CuSO4-->FeSO4 + Cu (less reactive).

Eric said: (Apr 15, 2013)  
Fe is more reactive than Cu, and so will displace copper in solution.

Srinivas said: (Jun 15, 2013)  
Iron oxidation state is two so iron accept sulphate ion according to mechanism.

Shashank Thorat said: (Jun 17, 2013)  
Fe has great affinity to the sulphate ion that shows Fe replaces the copper ion the formation of compound FeSo4 or cu can be separated.

Thanish Hijragama said: (Jul 21, 2013)  
Oxidation state of mercury can be +2, why can't be Hg then?

Akhabue Emmanuel Richards said: (Jul 22, 2013)  
It has to do with the reactivity of Fe, it displaces Cu from d compound CuSO4, unlike Na, which is less reactive. And reactivity is a function of what I will term "electrochemical positioning".

Mahaveer said: (Nov 1, 2013)  
Because iron is more reactive than copper. So, it is used to displace copper.

J Rey said: (Dec 11, 2013)  
Because iron is more reactive than copper and has an oxidation number of 2, unlike we can say mercury but it is an liquid metal at room temperature, so there is a reaction mechanism here. And Electrochemistry is applied or ionic equilibria is also.

Warrentheboss said: (May 19, 2014)  
The reaction series is as follows:

K Na Ca Mg Al Zn Fe Pb Cu Hg Ag Au

Since only Fe comes b4 copper, Fe can displace copper from the solution.

Aditya said: (May 28, 2014)  
Because iron is higher in the activity series than copper and we know that a metal higher in the activity series displaces the lower ones solution. Hence:-
CuSO4 + Fe--------------------------------->FeSO4 + Cu.

Bismark said: (Jun 18, 2014)  
I agree with @Tushar, @Preeti and @Lenhkp.

Its just because Fe is more reactive than Cu and so would displace the Cu in the reaction.

Arif said: (Aug 5, 2014)  
How please explain this question?

Prasad said: (Aug 6, 2014)  
Fe is a anode and cu is a cathode.

Kanhaiya said: (Aug 11, 2014)  
Then Na also should have reduced Cu because it lies way ahead of Cu in the electrochemical series, just like Fe.

Rajesh Kumar Das said: (Aug 23, 2014)  
FE is high reactive than cu.

Bhavna Rao said: (Aug 24, 2014)  
As the fe and cu both lying in the same group. And although the electronegativity of fe is higher than cu.

Shubham said: (Sep 21, 2014)  
Cu is biggest molecule.

Ronald said: (Sep 21, 2014)  
I Think Fe (Ferrum) will work best because it is not very reactive and yet it can displace copper from its sulphate. Sodium (NA or Natrium) can as well be used.

Amey Kasav said: (Oct 22, 2014)  
FE is iron then what is need?

Ambarish Deb said: (Oct 26, 2014)  
Iron(Fe) is more reactive than Copper(Cu). So Iron displaces Copper from Copper sulfate(CuSO4) to form Iron sulfate(FeSO4).

Kratik said: (Dec 6, 2014)  
The solution first at colour blue. After reacting it with Fe we get green colour now.

Likhitha said: (Feb 14, 2015)  
Fe reduces easily copper sulphate and forms ferrous sulphate due to its reducing property when compared with copper.

Nasir Iqbal said: (Mar 8, 2015)  

Sodium is not used for recovering of cu because cu present in aqueous solution, if sodium is as cathode then it react with water to form sodium hydroxide, hydrogen instead to act as cathode.

Alfiya said: (Apr 12, 2015)  
But the molecular formula of iron is Fe.

Aygun said: (Apr 19, 2015)  
Fe, it because of electrochemical series.

Hridan said: (Jun 5, 2015)  
Why Fe has more reduction power then Cu ?

Fe _ [Ar]18 3d6 4s2 & Cu_ [Ar]18 3d10 4s1.

So the reduction power of Fe is more then cu, as reduction power is nothing but ability to gain electron.

Harsh said: (Jun 16, 2015)  
It's simple displacement reaction.

cuso4+fe ->feso4+cu.

Aman said: (Aug 23, 2015)  
Fe lies above cu in metal activity series so it simply displaces cuso4.

Ankit said: (Aug 30, 2015)  
Reactivity of Fe is more than copper.

Jaydee said: (Sep 22, 2015)  
Any element higher than copper in the electrochemical series table will displace copper i.e. not copper itself.

Roy said: (Oct 1, 2015)  
If Fe is more reactive than Cu then Na is also more reactive than Cu. So why cannot we use Na to get Cu from copper sulphate solution.

Passerby said: (Oct 9, 2015)  
Wonderful study on research about fe.

Eliza said: (Oct 20, 2015)  
It is the most electronegative element.

Appolinaire Nges said: (Feb 5, 2016)  
I hold Fe as the answer; since Fe is found above Cu in the electrochemical series, it will displace Cu from CuSO4 to give FeSO4 and metallic Cu.

We talk of the electrochemical or reactivity series instead of electromagnetic series.

Thanks for your various proposed answers.

Fe + CuSO4 --------- = FeSO4 + Cu.

Appolinaire Nges said: (Feb 5, 2016)  

The most electronegative elements are nonmetals.

Jhansi said: (Feb 10, 2016)  
cuso4+fe = cu+feso4.

Ferrous sulphate formula feso4.

Sodium sulphate formula na2so4.

Silver sulphate formula ag2so4.

Mercury (hg) is not metal is acid.

So answer is fe.

Sanyukta said: (Feb 18, 2016)  
According to metal activity series, Fe is more reactive than Cu that means no reaction should take place and a less reactive element cannot replace a more reactive element and hence no reaction should take place. Then how come Cu replaces Fe?

Yacqub said: (Mar 4, 2016)  
Iron is less reactive than Cu according to the reactivity series table.

That is why iron is used to recover in the copper sulphate solution.

Heta Suthar said: (May 20, 2016)  
Refer the electrochemical series position of both the copper. So the answer is iron.

Tushar said: (Jul 12, 2016)  
Iron is more reactive metal than copper.

Gaya said: (Jul 23, 2016)  
Iron is having more reducing power than cupper.

Shankar said: (Aug 10, 2016)  
Sodium also is more reactive than copper. Why can't it displace copper from its solution?

Maanas said: (Aug 15, 2016)  
In the activity series, iron is more reactive element than copper. So iron can separate copper from copper sulfate.

Geethanjali said: (Aug 27, 2016)  
Actually both sodium and iron are able to displace copper from its solution. Right?

Sanka said: (Oct 6, 2016)  
There are two elements Na and Fe. Because both element is high level of metal activity series. Na is more react than Fe. But the answer is Fe. Because Na reacts with water. So it's not useful for recover than Fe.

Vicky said: (Nov 6, 2016)  
Fe is the right answer because ferrous is more reactive than copper due to which it will displace the copper from copper sulphate solution and the solution will become green in color due to the formation of ferrous sulphate and a brown layer of deposit layer will form on the iron metal.

Akashya Kumar Sahu said: (Nov 11, 2016)  
Iron(Fe) is the right answer as Fe is more reactive than Cu.When Fe reacts with CuSo4(cupper sulphate) solution ,it gives ferrous sulphate (FeSo4) and Cu will be deposited.

CuSo4 + Fe-------> FeSo4 + Cu.

Harshi said: (Mar 20, 2017)  
Fe is more reactive than cu thats why cu is displace from copper sulpate solution and thus formation of ferrous sulphate solution is made containing brown colour of doposit layer.

Rabi said: (Apr 11, 2017)  
Reduction potential of Fe is higher than that of Cu.

Vijay Shah said: (Apr 26, 2017)  
Fe is a anthode while cu is a cathode.

Naveen Dahiya said: (May 11, 2017)  
Fe is more electropositive that is more reactive that is a cause of decomposition rxn in which cu is displaced by Fe.

Cuso4 +fe =feso4 +cu.

Turram Khan said: (Oct 9, 2017)  
Fe is higher reactive than cu so it displaces fe in fe so4.

Rani said: (Nov 17, 2017)  
Fe is more electronegative than Cu so it will displace Cu according to displacement reaction.

Atul said: (Jun 18, 2018)  
It can also be Na.

Magdaline said: (Jun 23, 2018)  
But Fe is nonmetal, right?

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