Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity
(i) Fuel cell
(ii) Limiting molar conductivity
(i) Galvanic cells that are designed to convert the energy of combustion of fuels (methane, methanol etc.) directly into electrical energy are called fuel cells.
(ii) When the concentration approaches zero, the molar conductivity is known as limiting molar conductivity. It is represented by .
(ii) When the concentration approaches zero, the molar conductivity is known as limiting molar conductivity. It is represented by .
Calculate pH of following half-cell. Pt, \(H_2\) / \(H_2\)\(SO_4\) , if its electrode potential is 0.03V.
The conductivity of metals decreases while that of electrolytes increases with increase in temperature. Why?
State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution ?
The potential of a hydrogen electrode at pH = 10 is
a. 0.591 V
b. 0.00 V
c. – 0.591 V
d. -0.059 V
The conductivity of 0.20 M solution of KCl at 298 K is 0.025 Scm⁻¹. Calculate its molar conductivity.
The conductivity of a 0.01 M solution of acetic acid at 298 K is 1.65 x 10⁻⁴ S cm⁻¹. Calculate molar conductivity () of the solution.
Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity
State Raoult’s law. How is it formulated for solutions of non-volatile solutes ?
(i) Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :
= +0.80 V
= 0.00 V
On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ?
(ii) Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration ?
Define the following terms:
(i) Abnormal molar mass
(ii) van’t Hoff factor
Explain the following observation :
(i) Silver atom has completely filled d-orbitals (4d¹⁰) in its ground state, yet it is regarded as a transition element.
(ii) E° value for the Mn³⁺/Mn²⁺ couple is much more positive than Cr³⁺/Cr²⁺
State Henry’s law. What is the effect of temperature on the solubility of a gas in a liquid ?