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21. State Kohlrausch’s law of independent migration of ions.

Answer:

Kohlrausch examined Ëm° values for a number of strong electrolytes and observed certain regularities. He noted that the difference in Ëm° of the electrolytes NaX and KX for any X is nearly constant. For example
at 298 K:

Ëm°(KCl) – Ëm° (NaCl)= Ëm°(KBr) – Ëm°(NaBr)
= Ëm°(KI) – Ëm° (NaI) ≃ 23.4 S cm2 mol–1

and similarly it was found that
Ëm°(NaBr)– Ëm°(NaCl)= Ëm°(KBr) – Ëm°(KCl) ≃ 1.8 S cm2 mol–1

On the basis of the above observations he enunciated Kohlrausch
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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