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.
(i) Write the colligative property which is used to find the molecular mass of macromolecules.
(ii) In non-ideal solution, what type of deviation shows the formation of minimum boiling azeotropes?
In the following ions:
Mn³⁺, V³⁺, Cr³⁺, Ti⁴⁺
(Atomic no: Mn = 25, V = 23, Cr = 24, Ti = 22)
(a) Which ion is most stable in an aqueous solution?
(b) Which ion is the strongest oxidizing agent?
(c) Which ion is colourless?
(d) Which ion has the highest number of unpaired electrons?
The conductivity of metals decreases while that of electrolytes increases with increase in temperature. Why?
Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
What is meant by positive deviations from Raoult’s law ? Give an example. What is the sign of H for positive deviation ?