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244.
Electrolysis of molten NaCl gives sodium at cathode while aqueous NaCl gives H₂ gas at cathode.

Molten NaCl dissociates to give Na⁺ and Cl^-, Na⁺ then move towards cathode, picks up one electron and gets reduced to form Na.

Na⁺ +e^- ---> Na

In aqueous NaCl, as ^{$E_{\frac{H^{+}}{H_{2}}}^{0} > E_{\frac{{Na}^{+}}{Na}}^{0}$} , it is the hydrogen gas which liberates at cathode.

$2 H^{+} + 2 e^{-} \to H_{2}$

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245. What is dry cell? Explain its working.

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246. Draw curves to show how the molar conductance of strong electrolytes varies with dilutions.

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247. How the Kohlrausch’s law is used to determine the degree of ionization of weak electrolyte?

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248. For the cell Zn/Zn²⁺ (aq) || Cu²⁺(aq) | Cu, derive the relation between E°_cell and K_c at 298 k.

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249. For the standard cell, Cu(s) | Cu²+(aq) || Ag⁺ (aq) | Ag(s)
Given: E° _Cu²⁺/Cu = 0.34V, E° = 0.80V
(a) Identify cathode and anode as the current is drawn through the cell.
(b) Write the reactions taking place at the electrodes.
(c) Calculate the standard cell potential.

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250. What do you mean by a secondary cell? Discuss the function of lead storage battery.

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Previous Year Papers

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Electrochemistry

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244.
Electrolysis of molten NaCl gives sodium at cathode while aqueous NaCl gives H₂ gas at cathode.

Previous Year Papers

Test Series

Test Yourself

Short Answer Type

244. Electrolysis of molten NaCl gives sodium at cathode while aqueous NaCl gives H2 gas at cathode.

244.
Electrolysis of molten NaCl gives sodium at cathode while aqueous NaCl gives H₂ gas at cathode.