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Question

A solution of nickel sulphate in which nickel rod is dipped is diluted 10 times. The reduction potential of Ni at 298 K


A

decreases by 60 mV

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B

decreases by 30 mV

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C

increases by 60 mV

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D

increases by 30 mV

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Solution

The correct option is

B

decreases by 30 mV



E=Eo0.0592log[Ni2+]

E1=Eo0.0592log[Ni2+]10

EE1=0.0592log[Ni2+]Ni2+10

EE1=0.0295log10

=0.0295or0.03

E1=E+0.03V

E1=E+30mV

HencewemaysaythatthepotentialofNi2+electrodeincreasesby30mV


As the solution is diluted, new concentration would be 10 times lower, decreasing the voltage by 30 mV.



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