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 ...

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

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

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:

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...

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...

In a galvanic cell, the salt bridge

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.

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 ...

Limiting molar conductivity of NH4OH (i.e., Λom(NH4OH)) is equal to

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E0M2+/M) value has a positive sign?...

Molar conductivities at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol-1 respectively. for CH3COOH will be:...

Standard reduction potentials of the half reactions are given below: F2(g) + 2e- → 2F-(aq) ; Eo = + 2.85 V Cl2(g) 2e- → 2Cl-(aq) ; Eo = + 1.36 V Br2(g) + 2e- → 2Br-(aq) ; Eo = + 1.06...

Limiting molar conductivity of NH4OH (i.e. Λm (NH4OH)) is equal to :

Standard electrode potential of three metals X, Y, and Z are -1.2 V, + 0.5 V and -3.0 V respectively. The reducing power of these metals will be