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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?

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

Weak electrolytes: When the concentration of weak electrolyte becomes very low, its degree of ionisation rises sharply. There is sharp increase in the number of ions in the solution. Hence, the molar conductivity of a weak electrolyte rises steeply at low concentration.

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230.

Fluorine cannot be prepared from fluorides by chemical oxidation.

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