हिंदी

Using the standard electrode potential, find out the pair between which redox reaction is not feasible. EΘ values: FeX3+ / FeX2+=+0.77;IX2/IX−=+0.54; CuX2+ / Cu=+0.34;AgX+ / Ag=+0.80V - Chemistry

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प्रश्न

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

EΘ values: \[\ce{Fe^{3+} / Fe^{2+} = + 0.77; I2/I- = + 0.54}\];

\[\ce{Cu^{2+} / Cu = + 0.34; Ag+ / Ag = + 0.80 V}\]

विकल्प

  • \[\ce{Fe^{3+} and I-}\]

  • \[\ce{Ag+ and Cu}\]

  • \[\ce{Fe^{3+} and Cu}\]

  • \[\ce{Ag and Fe^{3+}}\]

MCQ

उत्तर

\[\ce{Ag and Fe^{3+}}\]

Explanation:

(i) \[\ce{2Fe^{3+} + 2e- -> 2Fe^{2+}; E^Θ = + 0.77 V}\]
                      \[\ce{2I- -> I2 + 2e- ; E^Θ = - 0.54 V (sign of E^Θ is revised)}\]
                                                                                           
     \[\ce{2Fe^{3+} + 2I- -> 2Fe^{2+} + I2; E^Θ_{cell} = + 0.23 V}\]

This reaction is feasible since \[\ce{E^Θ_{cell}}\] = + ve.

(ii)                \[\ce{Cu -> Cu^{2+} + 2e-; E^Θ = - 0.34 V (sign of E^Θ is revised)}\]
      \[\ce{2Ag+ 2e- -> Ag; E^Θ = + 0.80 V}\]
                                                                                               
     \[\ce{Cu + 2Ag+ -> Cu^{2+} + 2Ag; E^Θ = + 0.46 V}\]

This reaction is feasible since \[\ce{E^Θ_{cell}}\] = + ve.

(iii)  \[\ce{2Fe^{3+} + 2e- -> 2Fe^{2+}; E^Θ = + 0.77 V}\]
                           \[\ce{Cu -> Cu^{2+} + 2e-; E^Θ = - 0.34 V (sign of E^Θ is revised)}\]
                                                                                                    
          \[\ce{2Fe^{3+} + Cu -> 2Fe^{2+} + Cu^{2+}; E^Θ_{cell} = + 0.43 V}\]

This reaction is feasible since \[\ce{E^Θ_{cell}}\] = + ve.

(iv)                 \[\ce{Ag -> Ag^{+} + e-; E^Θ = - 0.80 V (sign of E^Θ is revised)}\]
     \[\ce{Fe^{3+} + 2e- -> Fe^{2+}; E^Θ = - 0.03 V}\]
                                                                                               
      \[\ce{Cu + 2Ag+ -> Cu^{2+} + 2Ag; E^Θ = + 0.46 V}\]

This reaction is not feasible since \[\ce{E^Θ_{cell}}\] = – ve.

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Redox Reactions and Electrode Processes
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 8: Redox Reactions - Multiple Choice Questions (Type - I) [पृष्ठ १०५]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 11
अध्याय 8 Redox Reactions
Multiple Choice Questions (Type - I) | Q 4 | पृष्ठ १०५

संबंधित प्रश्न

The more positive the value of EΘ, the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.

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\[\ce{Cu^{2+} / Cu = + 0.34; Ag+ / Ag = + 0.80V}\]


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