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Redox Reactions

Long Answer Type

161. Write the anode reaction, the cathode reaction and the net cell reaction for the following cells. Which electrode will be the positive terminal in each cell?

1. space space Zn left parenthesis straight s right parenthesis space vertical line space space Zn to the power of 2 plus end exponent space vertical line vertical line space Br to the power of minus comma space space space Br subscript 2 space vertical line space Pt left parenthesis straight s right parenthesis 2. space space space Cr left parenthesis straight s right parenthesis space vertical line space Cr to the power of 3 plus end exponent space vertical line vertical line space straight I to the power of minus comma space space straight I subscript 2 space straight I space Pt left parenthesis straight s right parenthesis 3. space space space Pt left parenthesis straight s right parenthesis space vertical line space straight H subscript 2 left parenthesis straight g right parenthesis comma space straight H to the power of plus left parenthesis aq right parenthesis space vertical line vertical line space Cu to the power of 2 plus end exponent vertical line space Cu left parenthesis straight s right parenthesis.

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162. Split the following redox reactions in oxidation and reduction half reactions:

left parenthesis straight a right parenthesis space 2 straight K left parenthesis straight s right parenthesis space plus space Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space space 2 KCl left parenthesis straight s right parenthesis left parenthesis straight b right parenthesis space 2 Al left parenthesis straight s right parenthesis space plus space 3 Cu to the power of 2 plus end exponent left parenthesis aq right parenthesis space space rightwards arrow space space space 2 Al to the power of 3 plus end exponent left parenthesis aq right parenthesis space plus space 3 Cu left parenthesis straight s right parenthesis

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163.

What is electrode potential? Name the factors on which it depends.

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164. What do you know about the standard hydrogen electrode? What is its significance ?

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Short Answer Type

165.

Can we measure the absolute value fo single electrode potential? Explain.

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166.

Define standard electrode potential of an electrode.

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Long Answer Type

167. How will you determine the standard reduction potential (E°) of an electrode experimentally?

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168. What is electrochemical series? What are its important applications?

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Short Answer Type

169.

Given the standard electrode potentials,

$straight K to the power of plus divided by straight K space equals negative 2.93 space straight V comma space space space Ag to the power of plus divided by Ag space equals space 0.80 space straight V Hg to the power of 2 plus end exponent divided by Hg space equals space 0.79 space straight V Mg to the power of 2 plus end exponent divided by Mg space equals space minus 2.37 space straight V comma space space space Cr to the power of 3 plus end exponent divided by Cr space equals space minus 0.74 space straight V arrange space these space metals space in space their space increasing space order space of space reducing space power.$

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170.
Arrange the following metals in order in which they displace each other:
Al, Cu, Fe, Mg, Zn.

We know that lower the reduction potential more the tendency to lose electrons and thus more will be the displacement, hence decreasing order of displacement power is Mg > Al > Zn > Fe > Cu.

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