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Question

Which of the following reactions cannot occur?


A

2AgNO3(aq)+Fe(s)Fe(NO3)2(aq)+2Ag(s)

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B

CuSO4(aq)+Zn(s)ZnSO4(aq)+Cu(s)

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C

CuSO4(aq)+2Ag(s)Ag2SO4(aq)+Cu(s)

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D

2AgNO3(aq)+Zn(s)Zn(NO3)2(aq)+2Ag(s)

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Solution

The correct option is C

CuSO4aq+2Ags→Ag2SO4aq+Cus


The explanation for correct option C:

  • Arrangement of the metals on the basis of their reactivity towards other elements is termed as activity series. The activity series in decreasing order is:

K>Na>Li>Ba>Sr>Ca>Mg>Al>Mn>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb>H>Sb>Bi>Cu>Hg>Ag>Au>Pt

  • Elements at the starting of this series are comparatively more reactive than elements present after them in the series.
  • In a single displacement reaction, an element from its compound is substituted by another element to form two product molecules. Elements that are more reactive according to the activity series can displace the elements less reactive than them from their compounds.
  • Since Silver Ag is less reactive than Copper Cu in the activity series, Silver Ag cannot displace Copper Cu from Copper sulphate CuSO4. Hence, the reaction between Silver Ag and Copper sulphate will not occur.

CuSO4aq+2Ags→Noreaction

The explanation for incorrect options:

A

  • Since Iron Fe is more reactive Silver Ag in the activity series, Iron can displace Silver Ag from Silver nitrate AgNO3. Hence, the reaction between Iron and Silver nitrate will occur.

2AgNO3aq+Fes→FeNO32aq+2Ags

B

  • Since Zinc Zn is more reactive Copper in the activity series, Zinc can displace Copper from Copper sulfate CuSO4 . Hence, the reaction between Zinc and Copper sulfate will occur.

CuSO4aq+Zns→ZnSO4aq+Cus

D

  • Since Zinc is more reactive Silver in the activity series, Zinc can displace Silver from Silver nitrate. Hence, the reaction between Zinc and Silver nitrate will occur.

2AgNO3aq+Zns→ZnNO32aq+2Ags

Final Answer: Hence, option C is correct.


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