ELECTRO CHEMISTRY
Each question is of three marks. .
1.(a)Define Faraday constant.How is it derived?
(b)The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500Ω.
What is the cell constant if conductivity of 0.001 M KCl solution at 298 K is 0.146 X 10-3 S/cm.
2.The standard electrode potential for Daniel cell is 1.1 V .Calculate the standard Gibb’s energy for
The reaction Zn(s) +Cu2+(aq) ------------- Zn2+(aq) +Cu(s)
3.Describe the preparation and electrode reactions of fuell cell .
4.Explain Kohlrausch’s law of independent migration of ions.Write its one application.
5.How conductivity of an unknown solution be determined ?explain
6. If a current of 0.5 amp flows through a metallic wire for 3 hrs, then how many electrons would flow throughthewire?
8. Predict the products of electrolysis of
. An aqueous solution of AgNO3 with platinum electrodes
. A dilute solution of H2SO4 with platinum electrodes
. An aqueous solution of CuCl2 with platinum electrode.
9.Explain the chemistry of lead storage battery while recharging .
10.Write the Nernst equation and calculate the emf of the following cell at 298 K:
Cu(s)I Cu2+(0.130M) II Ag+(1.00x10-4M) IAg(s)
Given E0 Cu2+ /Cu =+0.34 V and E0 Ag+ /Ag =+0.80 V.
11 . What are secondary cells? Give the anode and cathode reaction of nickel-cadmium cell.
12. Conductivity of 0.00241 M acetic acid is 7.896 x 10-5S/cm .If Λ0 for acetic acid is 390.5 Scm2/mol,what is the degree of dissociation ?
13.What does the negative value of E0 indicate?
Why is the equilibrium constant K, related to E0 cell and not Ecell ?
14.Rusting of iron is quicker in saline water than in ordinary water.why?
15.What would happen if the protective tin coating over an iron bucket is broken in some places?
Can a nickel spatula be used to stir a solution of copper sulphate ?Justify
16.Which out of 0.1 M HCl and 0.1 M NaCl ,do you expect have greater Λ∞ and why?
17.Which will have greater molar conductivity? Solution containing 1 mol KCl in 200 cc or 1 mol of KCl in 500 cc.
18.How will the value of Ecell change in an electrochemical cell involving the following reaction of the concentration of Ag+ (aq) is increased?
What will be e.m.f. when the cell reaches equilibrium:
Mg +2 Ag+ ------- Mg 2+ +Ag
19.In a cell reaction the equilibrium constant K is less than one. Is E0 for the cell positive?
What will be the value of K for E0= 0?
20.Write the units of resistance ,conductivity and resistivity .How are these related with eachother?
Each question is of three marks. .
1.(a)Define Faraday constant.How is it derived?
(b)The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500Ω.
What is the cell constant if conductivity of 0.001 M KCl solution at 298 K is 0.146 X 10-3 S/cm.
2.The standard electrode potential for Daniel cell is 1.1 V .Calculate the standard Gibb’s energy for
The reaction Zn(s) +Cu2+(aq) ------------- Zn2+(aq) +Cu(s)
3.Describe the preparation and electrode reactions of fuell cell .
4.Explain Kohlrausch’s law of independent migration of ions.Write its one application.
5.How conductivity of an unknown solution be determined ?explain
6. If a current of 0.5 amp flows through a metallic wire for 3 hrs, then how many electrons would flow throughthewire?
8. Predict the products of electrolysis of
. An aqueous solution of AgNO3 with platinum electrodes
. A dilute solution of H2SO4 with platinum electrodes
. An aqueous solution of CuCl2 with platinum electrode.
9.Explain the chemistry of lead storage battery while recharging .
10.Write the Nernst equation and calculate the emf of the following cell at 298 K:
Cu(s)I Cu2+(0.130M) II Ag+(1.00x10-4M) IAg(s)
Given E0 Cu2+ /Cu =+0.34 V and E0 Ag+ /Ag =+0.80 V.
11 . What are secondary cells? Give the anode and cathode reaction of nickel-cadmium cell.
12. Conductivity of 0.00241 M acetic acid is 7.896 x 10-5S/cm .If Λ0 for acetic acid is 390.5 Scm2/mol,what is the degree of dissociation ?
13.What does the negative value of E0 indicate?
Why is the equilibrium constant K, related to E0 cell and not Ecell ?
14.Rusting of iron is quicker in saline water than in ordinary water.why?
15.What would happen if the protective tin coating over an iron bucket is broken in some places?
Can a nickel spatula be used to stir a solution of copper sulphate ?Justify
16.Which out of 0.1 M HCl and 0.1 M NaCl ,do you expect have greater Λ∞ and why?
17.Which will have greater molar conductivity? Solution containing 1 mol KCl in 200 cc or 1 mol of KCl in 500 cc.
18.How will the value of Ecell change in an electrochemical cell involving the following reaction of the concentration of Ag+ (aq) is increased?
What will be e.m.f. when the cell reaches equilibrium:
Mg +2 Ag+ ------- Mg 2+ +Ag
19.In a cell reaction the equilibrium constant K is less than one. Is E0 for the cell positive?
What will be the value of K for E0= 0?
20.Write the units of resistance ,conductivity and resistivity .How are these related with eachother?
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