In a galvanic cell, the following cell reactions occurs:
E°cell = +1.56 V
(i) Is the direction of flow of electrons from zinc to silver or silver to zinc?
(ii) How will concentration of Zn²⁺ ions and Ag⁺ ions be affected when the cell functions?
E°cell = +1.56 V
(i) Is the direction of flow of electrons from zinc to silver or silver to zinc?
(ii) How will concentration of Zn²⁺ ions and Ag⁺ ions be affected when the cell functions?
(i) Zinc to silver
(ii) Concentration of Zn²⁺ ions will increase and Ag⁺ ions will decrease.
(ii) Concentration of Zn²⁺ ions will increase and Ag⁺ ions will decrease.
Following reactions can occur at cathode during the electrolysis of aqueous silver nitrate solution using Pt electrodes:
There are two possible reactions for cathode in the electrolysis of aqueous
\(ZnCl_2\) :\(Zn^{2+}\) (aq) + 2\(e^-\) → Zn(s) \(E^0\) = -0.76 V
2\(H_2\)O (l) + 2\(e^-\) → H2 (g) + 2\(OH^-\) (aq) \(E^0\) = - 0.83 V
Which one will take place? Why?
(i) State the law which helps to determine the limiting molar conductivity of weak electrolyte.
(ii) Calculate limiting molar conductivity of CaSO₄ (limiting molar conductivity of calcium and sulphate ions are 119.0 and 160.0 Scm² mol⁻¹ respectively)
Out of the following pairs, predict with reason which pair will allow greater conduction of electricity:
(i) Silver wire at 30°C or silver wire at 60°C.
(ii) 0.1 M \(CH_3\)COOH solution or 1 M \(CH_3\)COOH solution.
(iii) KCl solution at 20°C or KCl solution at 50°C.
Looking at the setup of an electrochemical cell, what happens when \(E_{ext}\) > 1.1 V
The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________.
a. Cell potential.
b. Electromotive Force.
c. Potential difference.
d. Cell voltage.
The conductivity of an aqueous solution of NaCl in a cell is 92 \(Ω^{−1}\) \(cm^{-1}\) the resistance offered by this cell is 247.8 Ω . Calculate the cell constant.
Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
In a galvanic cell, the following cell reactions occurs:
E°cell = +1.56 V
(i) Is the direction of flow of electrons from zinc to silver or silver to zinc?
(ii) How will concentration of Zn²⁺ ions and Ag⁺ ions be affected when the cell functions?
Explain why :
(i) E° for Mn³⁺/Mn²⁺ couple is more positive than that for Fe³⁺/Fe²⁺. (At. Nos. Mn = 25, Fe = 26).
(ii) Ce³⁺ can be easily oxidized to Ce⁴⁺. (At. No.Ce = 58).
How many electrons flow when a current of 5 amps is passed through a solution for 193 sec ? Given F = 96500 C. \(N_0\) = 6.002 × \(10^{23}\) \(mol^{-1}\).
The following curve is obtained when molar conductivity is plotted against the square root of concentration, c½ for two electrolytes A and B :
State Raoult’s law for a solution containing nonvolatile solute. What type of deviation from Raoult’s law is shown by a solution of chloroform and acetone and why?