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The standard reduction potentials of Cu^...

The standard reduction potentials of `Cu^(=2),Ag^(+),Hg^(+2)` and `Mg^(+2)` are `0.34v,+0.80v,+0.79V` and `-2.37V` respectively. With increasing voltage, the squence of deposition of metals on the cathode from a molten mixture containing all those ions is

A

Ag, Hg, Mg, Cu

B

Cu, Hg, Ag, Mg

C

Ag, Hg, Cu, Mg

D

Cu, Hg, Mg, Ag

Text Solution

Verified by Experts

The correct Answer is:
B
Metal ions with higher S.R.P discharged first.
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Knowledge Check

  • A solution containing one mole per litre each of Cu(NO_(3))_(2),AgNO_(3),Hg_(2)(NO_(3))_(2),Mg(NO_(3))_(2) is being electrolyesd by using inert electrodes. The value of standard reduction potentials are Ag^(+)//Ag= +0.80V,Hg_(2)^(2+)//Hg=0.79V, Cu^(2+)// Cu=+0.34V,Mg^(2+)//Mg=-2.7V. with increasing voltage, the sequence of deposition of metals on the cathode will be:

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    AG,MgHg,Cu
    B
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    C
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    D
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  • Reduction potentials of A, B, C and D are 0.8 V, 0.79 V ,0.34 V and -2.37 V respectively. Which element displaces all the other three elements ?

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  • Reduction potential of A,B,C and D are 0.8V, 0.79V, 0.34V and -2.37V respectively. Which element displaces all the other three elements

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