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 × \(10^{23}\) \(mol^{-1}\).
Q = It = 5 X 193 = 965 C
96500C = 1 mol of electrons = 6.002 × \(10^{23}\) \(mol^{-1}\)
965 C = 6.002 × \(10^{23}\) × 965/96500
= 6.002 × \(10^{21}\) electrons.
96500C = 1 mol of electrons = 6.002 × \(10^{23}\) \(mol^{-1}\)
965 C = 6.002 × \(10^{23}\) × 965/96500
= 6.002 × \(10^{21}\) electrons.
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 electrical resistance of a column of 0.05 M KOH solution of diameter 1 cm and length 45.5 cm is 4.55 × 10³ ohm. Calculate its molar conductivity.
State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution ?
The conductivity of metals decreases while that of electrolytes increases with increase in temperature. Why?
Calculate emf of the following cell
Cd/\(Cd^{2+}\) (.10 M)//\(H_+\) (.20 M)/\(H_2\) (0.5 atm)/Pt
[Given E° for \(Cd^{2+}\) /Cd = -0.403V]
State Henry’s law. What is the effect of temperature on the solubility of a gas in a liquid ?
(i) Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why ?
(ii) In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes ?
Calculate the molality of ethanol solution in which the mole fraction of water is 0.88.
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?
A 1.00 molar aqueous solution of trichloroacetic acid (CCl₃COOH) is heated to its boiling point. The solution has the boiling point of 100.18 °C. Determine the van’t Hoff factor for trichloroacetic acid. ( for water = 0.512 K kg mol⁻¹).
Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity