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Electrochemistry

Multiple Choice Questions

221. The standard reduction potential values of the three metallic cations, X, Y, Z are 0.52, – 3.03 and - 1.18 V respectively. The order of reducing power of the correspor ding metals is

Y > Z > X
X > Y > Z
Z > Y > X
Z > X > Y

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Short Answer Type

222. How is cell constant related to specific conductance of electrolyte?

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223. Can we store aqueous copper sulphate solution in iron vessel?

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224. Which type of electrolytes are used in salt bridge?

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225. For a half-cell reaction: C₆H₅NO₂ → C₆H₅NH₂. What is the value of n in Nernst equation of electrode potential?

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226. What is the sign for $∆$ G for a spontaneous cell reaction?

Free energy change $∆$ G is measure of the spontaneity of a chemical reaction or process.

$∆ G = - nFE$

Where
-n =number of moles of electron
F= the quantity of electrical charge that is contained in 1mole of electrons.This is the Faraday constant i.e. 1F= 96500 Coloum/mole of electron

F and n are positive value. therefore as positive value of E (which indicte spontaneity )and thus negtive value for G (which also indicate spontaneity)