Electrochemistry Questions

Standard electrode potential for Sn4+ / Sn2+ couple is +0.15 V and that for the Cr3+ / Cr couples is - 0.74. These two couples in their standard state are connected to make a cell. The cell potential ...

Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.4 S m-1. The resistance of 0.5 M solution of the same electrolyte is 280 Ω. The molar co...

The equivalent conductance of NaCl at concentration C and at infinite dilution are λC and λ∞ respectively. The correct relationship between λC and λ∞ is given as (Where...

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is

Given below are the half-cell reactions Mn2+ + 2e- → Mn ; Eo = - 1.18 V (Mn3+ + e- → Mn2+) ; Eo = + 1.51 V The Eo for 3 Mn2+ → Mn + 2Mn3+ will be...

When 0.1 mol MnO42- is oxidised the quantity of electricity required to completely oxidise MnO42- to MnO4- is...

The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be

Consider the electrode Ag | AgCl(s), Cl-(0.1 M), i.e., silver electrode in contact with 0.1 M KCl solution saturated with AgCl. If it is combined with the electrode Ag | Ag+(0.1 M) to from a complete ...

For the cell (at 298 K) Ag(s) | AgCl(s) | Cl- (aq) || AgNO3 (aq) | Ag(s) Which of following is correct -

A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively.

In the electrochemical cell :- Zn|ZnSO4(0.01M)| |CuSO4(1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that of CuSO4 changed to 0.01M, the emf chan...

The pressure of H2 required to make the potential of H2 - electrode zero in pure water at 298 k is:

In a galvanic cell, the salt bridge

An organic compound A upon reacting with NH3 gives B. On heating, B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. A is :-...

At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm-1 cm2mol-1 and at infinite dilution its molar conductance is 238 ohm-1 cm2 mol-1. The degree of ionization of ...

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode...

A button cell used in watches function as followingZn(s) + Ag2O(s) + H2O(l) ⇋ 2Ag(s) + Zn2+(aq) + 2OH-(aq) If half cell potentials areZn2+(aq) + 2e- → Zn(s) ; Eo = -0.76V Ag2O(s) + H2O(l) ...

Given :E0(Cr+3/Cr) = -0.74 ; E0(MnO4-/Mn+2) = 1.51 VE0(Cr2O7-2/Cr+3) = 1.33 V; E0(Cl/Cl-) = 1.36 VBased on the data given above, strongest oxidising agent will be :...

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E0M3+/M2+ value ?...

An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List-I. The variation in conductivity of these reactions is given in List-II. Match List-I with List-II and select the ...