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(a) Use the following reactions to arrange the elements A ,B, C and D in order of their redox reactivity : (i) A+B^(+) rarr A^(+) +B (ii) B+D^(+) rarr B^(+)D (iii) C^(+) +D rarr No reaction (iv) B+C^(+) rarrB^(+) C (b) On the basis of above redox activity series predict which of the following reactions would you expect to occur. (i) A^(+)CrarrA+C^(+)(ii) A^(+) +DrarrA+D^(+)

Answer» <html><body><p></p>Solution :(a) The electrochemical series or redox activity is <a href="https://interviewquestions.tuteehub.com/tag/based-389387" style="font-weight:bold;" target="_blank" title="Click to know more about BASED">BASED</a> on the decreasing order of reduction <a href="https://interviewquestions.tuteehub.com/tag/potentials-1161455" style="font-weight:bold;" target="_blank" title="Click to know more about POTENTIALS">POTENTIALS</a>. This <a href="https://interviewquestions.tuteehub.com/tag/means-1091780" style="font-weight:bold;" target="_blank" title="Click to know more about MEANS">MEANS</a> that the species which gets reduced is higher in the electrochemical series as compared to the other which is to get oxidised (lose electrons ) <br/> In reaction (i), `B^(+)` gets reduced by A and <a href="https://interviewquestions.tuteehub.com/tag/therefore-706901" style="font-weight:bold;" target="_blank" title="Click to know more about THEREFORE">THEREFORE</a> B is higher than A in electrochemical series. <br/> In reaction (ii) `D^+` gets reduced by B and therefore , D is higher in electrochemical series than B. In reaction (iii) `C^+` does not get reduced by D, therefore , C is lower than D in electrochemical series. But according to reaction (iv) `C^(+)` gets reduced by B and therefore , C is higher in electrochemical, series than B Thus , the correct order is <br/> `D gt C gt B gt A ` <br/> (b) Both reactions donot occur because A cannot be reduced by C as well as D.</body></html>


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