_________ equation shows the relation between the Gibbs energy of the reaction and the emf of the cell.
ΔrG = nFE
ΔrG = -nFE
ΔrG = nF Kc
ΔrG = -nF Kc
______ gas is the strongest oxidising agent
Oxygen
Hydrogen
Fluorine
Nitrogen
If the standard electrode potential is ___________, then hydrogen gas is more stable than the reduced form of the species.
Zero
Less than zero
Unity
Greater than zero
An electrochemical cell is shown below
Pt, H2 (1 atm) |HCl (0.1 M)| CH3COOH(0.1 M)| H2 (1 atm), Pt. the emf of the cell will not be zero, because
emf depends on molarities of acids used
pH of 0.1 M HCl and 0.1 M CH3CHOOH is not same
The temperature is constant
Acids used in two compartments are different
Without losing its concentration ZnCl2 solution cannot be kept in contact with
Au
Al
Pb
Ag
The efficiency of a fuel cell is given by
ΔG / ΔS
ΔG / ΔH
ΔS / ΔG
ΔH / ΔG
On the basis of the following Eo Values, the strongest oxidising agent is
[Fe(CN)6]4-
Fe2+
Fe3+
[Fe(CN)6]3-
___________ ion is the weakest oxidising agent.
Lithium
Oxide
EoFe2+/Fe = -0.441 V and EoFe2+/Fe2+= 0.771V, the standard emf of the reaction Fe +2Fe3+ →3Fe 2+ will be
0.111 V
0.330 V
1.653 V
1.212 V
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is
1.25 × 10-5
1.25 × 10-6
6.25 × 10-4
1.25 × 10-4
