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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions2 Marks
Question
a. Which of the following does not conduct electric current and why? Molten NaCl , Solid $\mathrm{Pb}, \mathrm{AgNO}_3$ solution and Methanol.
b. Why is anode called oxidation electrode, whereas cathode is called reduction electrode?
c. Why is reduction potential of zinc -0.76 V ?
✓

Answer

a. Methanol will not conduct electric current because it does not ionise.
b. At anode, loss of electrons takes place, i.e. oxidation takes place, whereas at cathode, gain of electrons takes place, i.e. reduction takes place. Therefore, cathode is called reduction electrode and anode is called oxidation electrode.
c. The reduction potential of Zn is -0.76 V , because the potential difference between Zn electrodes dipped in 1 M $\mathrm{ZnSO}_4$ solution and standard hydrogen electrode is 0.76 V and Zn metal acts as anode, i.e., undergoes oxidation, therefore, its reduction potential is -ve.

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