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Electrochemistry

Short Answer Type

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?

Answer:
At any concentration c, if a is the degree of dissociation then it can be approximated to the ratio of molar conductivity Ëm at the concentration c to limiting molar conductivity, Ëm°. Thus we have

Λ_m and degree of dissociation (a) are related by the equation

α = \frac{{A^{c}}_{m}}{{A^{\infty}}_{m}}

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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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