Sarthaks Test
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Using the standard electrode potentials given in the Table 8.1, predict if the reaction between the following is feasible: 

(a) Fe3+(aq) and I (aq) 

(b) Ag+(aq) and Cu(s) 

(c) Fe3+ (aq) and Cu(s) 

(d) Ag(s) and Fe3+(aq) 

(e) Br2(aq) and Fe2+(aq) 

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1 Answer

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Answer: We have

(a) The possible reaction between  Fe3+(aq) +  I-(aq) 

2Fe3-  +  2I- (aq)   →    2Fe2+  +  I2(s)         is given by,

E° for the overall reaction is positive. Thus, the reaction between  Fe3+(aq) and  I-(aq) is feasible

(b) The possible reaction between  Ag+(aq)  +  Cu(s) is given by, 

E° positive for the overall reaction is positive. Hence, the reaction between  Ag+(aq) and Cu(s) is feasible. 

 (c) The possible reaction between Fe3+(aq) and  Cu(s)  is given by, 

E° positive for the overall reaction is positive. Hence, the reaction between Fe3+(aq) and Cu(s) is feasible.

 (d) The possible reaction between Ag(s) and  Fe3+(aq)

Here, E° for the overall reaction is negative. Hence, the reaction between Ag(s) and Fe3+(aq) is not feasible. 

(e) The possible reaction between Br2(aq) and Fe2+(aq) is given by, 

Here, E° for the overall reaction is positive. Hence, the reaction between Br2(aq) and Fe2+(aq) is feasible

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