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Electrochemistry

Short Answer Type

231. Which factor makes secondary cells more acceptable as a source of power?

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232. Write Nernst equation for single electrode potential.

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233. Why is the equilibrium constant k related to only E°_cell and not E_cell.

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234. How does the molar conductivity of KCl solution vary with increasing concentration?

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235. Give an example of fuel cell.

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236. Write the symbolic notation for standard hydrogen electrode and its potential.

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237. What is a galvanic cell? What type of reactions give rise to electric current in a galvanic cell and how?

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238. What information is conveyed by the cell rotation given below?
Cu(s) | Cu²⁺ (aq) (0.1 M) || Ag⁺ (aq) (0.2 M) | Ag(s)

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239. What is a salt bridge and what function does it save in a galvanic cell?

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240. What is meant by ‘standard electrode potential’ on the hydrogen scale?

A half-cell called standard hydrogen electrode
represented by Pt(s)l H₂(g)lH+(aq), is assigned
a zero potential at all temperatures corresponding to the reaction;

H⁺ (aq) + e^- ---->1/2H₂(g)

The standard hydrogen electrode consists of a platinum electrode coated with platinum black. The electrode is dipped in an acidic solution and pure hydrogen gas is bubbled through it.

The concentration of both the reduced and oxidised forms of hydrogen is maintained at unity . This implies that the pressure of hydrogen gas is one bar
and the concentration of hydrogen ion in the
solution is one molar.

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