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12th Standard English Medium Chemistry Subject Electro Chemistry Book Back 3 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 15

    Part I

    5 x 3 = 15
  1. The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5\(\times\)10-4 S cm−1.
    i) molar conductivity of the solution
    ii) degree of dissociation and the dissociation constant of the weak electrolyte
    Given that
    \(\lambda^{0}_{cation}=248.2 \ S\) cm2 mol-1
    \(\lambda^{0}_{anlon}=51.8 \ S\) cm2 mol-1

  2. Why is AC current used instead of DC in measuring the electrolytic conductance?

  3. A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.

  4. Is it possible to store copper sulphate in an iron vessel for a long time?
    Given : \(E^{0}_{Cu^{2+}|Cu} = 0.34\) V and \(E^{0}_{Fe^{2+}|Fe} = -0.44\)V.

  5. Reduction potential of two metals M1 and M2 are \(E^{0}_{M^{2+}_{1}|M_{1}} = -2.3V\) and \(E^{0}_{M^{2+}_{1}|M_{1}} = 0.2V\) Predict which one is better for coating the surface of iron. Given : \(\mathrm{E}_{\mathrm{Fe}^{2+} \mid \mathrm{Fe}}^{\circ}=-0.44 \mathrm{~V}\)

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