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Which of the following metals is eliminated by copper from salt solutions?

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ZnS O_{4}

AgN O_{3}

FeS O_{4}

All of these

answer is A.

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Detailed Solution

Copper displaces

AgN O_{3}

from their salt solutions.

Cu + 2 AgN O_{3} ​ \to 2 Ag + Cu (N O_{3} ​)_{2}

Cu + ZnS O_{4} ​ \to No reaction

Cu + FeS O_{4} ​ \to No reaction

Since it is evident, copper has a higher reduction potential than Zn and Fe. It is therefore unable to displace them from their salts. Cu will displace Ag from

AgN O_{3}

solution as Cu is placed above Ag is the emf series (group of Cu and group of Ag).

E^{0} Z n^{+ 2} / Zn = - 0.76 V

E^{0} C u^{2 +} / Cu = + 0.34 V

E^{0} F e^{2 +} / Fe = - 0.40 V

E^{0} A g^{+} / Ag = + 0.80

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