Video Lecture-1- https://www.youtube.com/watch?v=szr6yVOLGl8&index=2&list=PLMtKgrUznSgdchm8RhZnvnUTGmuinWP0a

**1.**Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

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**2. **Calculate the emf of the cell in which the following reaction takes place:

Ni + 2 Ag(+) (0.002 M)= Ni(+2) (0.160 M)+ 2Ag Given that Eo = 1.05 V

**3:**The cell in which the following reactions occurs:

2Fe(+3) + 2I(-) = 2Fe(+2) + I2 Eo = 0.236 V at 298 K. Calculate the standard Gibbs energy and the equilibrium constant of the cell reaction.

**4:**Why does the conductivity of a solution decrease with dilution?

Video-2-Electrochemistry https://www.youtube.com/watch?v=IPL8_7DtB5k&index=3&list=PLMtKgrUznSgdchm8RhZnvnUTGmuinWP0a

**5:**The molar conductivity of 0.025 mol L−1 methanoic acid is 46.1 S cm2 mol^{−1}.Calculate its degree of dissociation and dissociation constant. Given λ ^{°}(H^{+}) = 349.6 S cm^{2} mol^{−1} λ ^{°}(HCOO−) = 54.6 S cm^{2} mol *C* = 0.025 mol L^{−1}

**6:**If a current of 0.5 ampere flowsthrough a metallic wire for 2 hours, then how many electrons would flow through the wire?

**7:**What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr2O7(-2) to Cr(+3).

**8:**Write the chemistry of rechargingthe lead storage battery, highlighting all the materials that are involved during recharging.

**9:**Suggest two materials other than hydrogen that can be used as fuels in fuel cells.Ans - Methane and methanol can be used as fuels in fuel cells.

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**10:**Calculate the standard cellpotentials of galvanic cells in which the following reactions take place:** **2Cr(s) + 3Cd^{2+}(aq) → 2Cr^{3+}(aq) + 3Cd **(ii) **Fe^{2+}(aq) + Ag^{+}(aq) → Fe^{3+}(aq) + Ag(s)

Eo (Cr) = 0.74 V , Eo(Cd) = -0.40 Calculate the Δ_{r}*G*^{θ} and equilibrium constant of the reactions **(**

**11:**Write the Nernst equation and emfof the following cells at 298 K:

** (i) **Sn(s) | Sn^{2+}(0.050 M) ||H^{+}(0.020 M) | H_{2}(g) (1 bar) | Pt(s)

**(iii) **Pt(s) | Br_{2}(*l*) |Br^{−}(0.010 M) || H^{+}(0.030 M) | H_{2}(g) (1 bar) |Pt(s).

**12:**In the button cells widely used in watches and other devices the following reaction takes place:

Zn(s) + Ag_{2}O(s) + H_{2}O(*l*) → Zn^{2+}(aq) + 2Ag(s) + 2OH^{−}(aq) Determine Gibbs energy for the reaction

**13:**Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

**14:**The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 Scm^{−1}. Calculate its molar conductivity.Given, *κ* = 0.0248 S cm^{−1 }c = 0.20

Calculate for all concentrations and draw aplot between and c½. Find the value of.

**15:**Conductivity of 0.00241 M acetic acid is 7.896 × 10^{−5} S cm^{−1}. Calculate its molar conductivity and if molar conductivity at infinite dilution for acetic acid is 390.5 S cm^{2} mol^{−1}, what is its dissociation constant?

Given,*κ* = 7.896 × 10^{−5} S m^{−1 }c = 0.00241 mol L^{−1}

**16: **How much electricity in terms ofFaraday is required to produce

** (i) **20.0 g of Ca from molten CaCl_{2}. **(ii) **40.0 g of Al from molten Al_{2}O_{3}.

**17:**A solution of Ni(NO_{3})_{2} is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?

**18: **Three electrolytic cells A,B,Ccontaining solutions of ZnSO_{4}, AgNO_{3} and CuSO_{4},respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?

**19:**Predict the products ofelectrolysis in each of the following:

** (i) **An aqueous solution of AgNO_{3}with silver electrodes.

**(ii) **An aqueous solution of AgNO_{3}with platinumelectrodes.

**(iii) **A dilute solution of H_{2}SO_{4}withplatinum electrodes.

**(iv) **An aqueous solution of CuCl_{2} with platinumelectrodes.

20. What is meant by Fuel cell ? Also give itsreactions?

21.The conductivity of 0.001 M Acetic acid is 4.95 x 10^{-5} S cm^{-} . Calculate the dissociation constant. If molar conductivity for acetic acid at infinite dilution is 390.5 S cm^{2} mol^{-1} .

22.The conductivity of saturated sol^{n} of AgCl at 288K is found to be 1.382 x 10^{-6} S cm^{-} . Find its solubility . Given ionic conductances of Ag^{+} & Cl^{-} at infinite dilution are 61.9 , 76.3 S cm^{2} mol^{-}

23 .Find the charge in Coulombs on 1 g-ion of N^{-3}.