Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
(i) Molar conductivity (),
(ii) Secondary batteries.
(i) Molar conductivity () : Molar conductivity is defined as the conductivity due to all the ions produced by dissolving one mole of an electrolyte in solution.
(ii) In secondary batteries, the reactions can be reversed the cell reactions imposing a higher voltage than the E.M.F. of cell (external voltage). These batteries can be recharged by passing
electric current and used again and again.
(ii) In secondary batteries, the reactions can be reversed the cell reactions imposing a higher voltage than the E.M.F. of cell (external voltage). These batteries can be recharged by passing
electric current and used again and again.
Calculate pH of following half-cell. Pt, \(H_2\) / \(H_2\)\(SO_4\) , if its electrode potential is 0.03V.
The conductivity of 0.20 M solution of KCl at 298 K is 0.025 Scm⁻¹. Calculate its molar conductivity.
The conductivity of metals decreases while that of electrolytes increases with increase in temperature. Why?
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
State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution ?
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]
Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
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?
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⁺
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?
State Raoult’s law for the solution containing volatile components. What is the similarity between Raoult’s law and Henry’s law ?
Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity