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Electrochemistry

Long Answer Type

111. What is the Nernst equation for the Potential of an electrode? Can Nernst equation be applied to the cell relation ? Apply this equation to a general reaction.

aA + bB \to cC + dD

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112. Explain Kohlrausch’s law of independent migration of ions. Mention one application of Kohlrausch’s law.

900 Views

Short Answer Type

113. How does molar conductivity vary with concentration for (i) weak electrolyte and for (ii) strong electolyte? Give reasons for these variations.

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114. State and explain Faraday's law of electrolysis?

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Long Answer Type

115. State and explain Faraday's law of electrolysis?

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116. Show that the electrical work obtainable from a galvanic cell is given by the expression.

∆ G ° = - nFE °_{cell}

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Short Answer Type

117. What are fuel cells? Write the reaction of a oxygen hydrogen fuel cell.

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118.
What is a mercury cell? Give the electrode reactions?

A mercury battery (also called mercuric oxide battery, or mercury cell) is a non-rechargeable electrochemical battery, a primary cell. Mercurybatteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte.

Mercury cell is a new type of dry cell. It consists of
Anode: Zinc-mercury.
Cathode: Paste of HgO and carbon
Electrolyte: Paste of ZnO in KOH.

The reactions are:
Anode:
Zn (amalgam) +

2 {OH}^{-} \to ZnO (s) + H_{2} O + 2 e^{-}

At cathode:

HgO + H_{2} O + 2 e^{-} \to Hg (l) + 2 {OH}^{-}

Overall reaction:

Zn (amalgam) + HgO (s) \to ZnO (s) + Hg (l)

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119. What is the effect of change in (a) concentration, (b) temperature on the electrode potential of a given half-cell?

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120. Iron does not rust even if the zinc coating is broken in a galvanised iron pipe but, rusting occurs much faster if the tin coating over iron is broken. Explain?

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