Multiple choice

Which of the following expressions represents the equilibrium constant for the following redox reaction?

Cu2+(aq) + Zn(s) -------> Zn2+(aq) + Cu(s)

  1. [Zn2+][Cu]/[Cu2+][Zn]

  2. [Cu2+][Zn]/[Zn2+][Cu]

  3. [Cu2+]/[Zn2+]

  4. [Zn2+]/[Cu2+]
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because while the formula for equilibrium constant it is generalized as K = [products]/[reactants] ………………..where the concentration of pure reactants and products is taken to be unity.In the given reaction the concentration of reactant Zn(s) and product Cu(s) is to be taken unity and hence we will get the correct answer as K = [Zn2+]/[Cu2+]

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