Q15 of 26 Page 1

Calculate of the following reaction at 298K :


Given :


Eocell,also called as cell voltage or cell potential,is the electromotive force between two half-cells.


Eocellcan be calculated as follows:



Eocell= -0.44-(-0.74) = 0.30 V


In this above reaction, six electrons are transferred from Cr to Fe


From the nernst equation at 298K,


Ecell= Eocell–log (here n is no. of electrons participated in given reaction)


Ecell= Eocell- log


Ecell= 0.30 + 0.01 = 0.31V


More from this chapter

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13

A. Out of silica gel and anhydrous which will adsorb the water vapours?

B. Out of and which one is more effective in causing coagulation of positively charged sol? Give reason.


C. Out of sulphur sol and proteins, which one forms macromolecular colloids?


 14

A. Name the method of refining Zirconium.

B. In the extraction of Al, impure is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?


C. What is the function of limestone in the extraction of iron from its oxides?


 16

Give reasons :

A. Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4


B. Zn is soft whereas Cr is hard.


C. is a good reducing agent.


 17

What happens when :

A. 2, 4, 6 – trinitrochlorobenzene is treated with warm water.


B. 2-chlorobutane is treated with alcoholic KOH.


C. Ethyl chloride is treated with Na metal in presence of dry ether.


Write the equation involved in the above reactions.