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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 mVE=Eo−0.0592log[Ni2+]E1=Eo−0.0592log[Ni2+]10E−E1=−0.0592log[Ni2+]Ni2+10E−E1=−0.0295log10=−0.0295or−0.03E1=E+0.03VE1=E+30mVHencewemaysaythatthepotentialofNi2+electrodeincreasesby30mV As the solution is diluted, new concentration would be 10 times lower, decreasing the voltage by 30 mV.

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