21.State Kohlrausch’s law of independent migration of ions.
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22.How is molar conductivity related to the degree of dissociation?
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23.How is molar conductivity related to the degree of dissociation?
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24.Given the two half cell reaction: Anode: Cu(s) → Cu2+ (aq) + 2e– Cathode: Ag+ (aq) + e– → Ag(s) Write the galvanic cell for the net reaction.
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25.The electrode potentials of four elements A, B, C and D are 1.36 V - 0.32 V, 0.0 V and – 1.26 V respectively. Arrange these elements in the decreasing order of reactivity.
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26.What happens to free energy during operation of a cell?
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27.What is it that ‘Al’ metal cannot be obtained by electrolysis of an aqueous solution of a salt of aluminium?
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28.How many Faradays of electricity are required to liberate 2 moles of hydrogen gas in electrolysis of aq. solution?
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29.In operation of a galvanic cell, at one of its electrodes oxidation takes place. What is the name of electrode and what is its polarity?
Answer: It is a method of protecting a metal from corrosion by connecting it with another metal that is more easily oxidised. for example zinc and aluminium used to protect iron.
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