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?
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162.Split the following redox reactions in oxidation and reduction half reactions:
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163.
What is electrode potential? Name the factors on which it depends.
164.What do you know about the standard hydrogen electrode? What is its significance ?
It consists of platinum foil or wire coated with platinum black dipped into a molar (1 M) solution of H+ ions and hydrogen gas is continuously passed through it at 298 K and 1-atmosphere pressure.
This electrode may serve as anode or cathode depending upon the nature of another electrode to which it is connected. S.H.E. acts as an anode i.e. oxidation takes place, the following reaction occurs:
S.H.E. acts as a cathode i.e. reduction takes place, the following reaction occurs:
Thus S.H.E. is a reversible electrode.
The standard electrode potential (E°) of a standard hydrogen electrode is taken to be 0.00 volt. It is usually represented as Pt, H2(g), (1 atm) [H+ (1 M)] Significance. It is used as a reference electrode to measure the relative value of electrode potential of a given electrode.
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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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169.
Given the standard electrode potentials,
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170.
Arrange the following metals in order in which they displace each other: Al, Cu, Fe, Mg, Zn.
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