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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?

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227. How can the standard oxidation potential of an electrode be raised up?

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228. How does free energy change related to emf of cell?

Gibbs Free Energy is defined as the thermodynamic potential that signifies the maximum or reversible work performed by a thermodynamic system at constant temperature and pressure. i.e.

$∆_{r} G ° = - {nFE}_{c e l l}^{0} a l s o ∆_{r} G ° = - R T I n k t h u s - R T I n k = - n F E_{c e l l}^{0} E_{c e l l}^{0} = \frac{R T}{n F} I n K$

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229. What is the effect of decreasing concentration on the molar conductivity of weak electrolyte?

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230.

Fluorine cannot be prepared from fluorides by chemical oxidation.

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