A hypothetical electrochemical cell is shown below.
A + B+ A+ + B
A+ + B A + B+
A+ + e- A; B+ + e- B
the cell reaction cannot be predicted
Cell reaction is spontaneous when.
Eored is negative.
Eored is positive
is negative
is positive
In electrolysis of NaCI when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam because.
Hg is more inert than Pt.
More voltage is required to reduce H+ at Hg than at Pt.
Na is dissolved in Hg while it does not dissolved in Pt.
Concentration of H+ ions is larger when Pt electrode is taken.
An electrochemical cell is shown below;
Pt,H2[1atm]/HCI (0.1M)//CH3COOH(0.1M)H2(1atm),Pt. The emf of the cell will not be zero, because
Emf depends on molarities of acids used.
pH of 0.1 M HCI and 0.1 M CH3COOH is not same
The temperature is constant.
Acids used in two compartments are different.
Without losing its concentration ZnCI2 solution cannot be kept in contact with.
Au
AI
Pb
Ag
Kohlrausch's law states that at.
Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte .
Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.
Infinite dilution, each ion makes definite contribution to conductance of an electrolyte , whatever be the nature of the other ion of the electrolyte.
Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte. whatever be the nature of the other ion of the electrolyte.
Standard free energies of formation (in KJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H2O(l) CO2(g) and pentane (g), respectively. The value of Eocell for the pentane-oxygen fuel cell is.
1.968 V
2.0968 V
1.0968 V
0.0968 V
The equivalent conductances of Ba2+ and Cl- are 127 and 76 ohm-1 cm-1 eq-1 respectively at infinite dilution. The equivalent conductance of BaCI2 at infinite dilution will be.
139.52
203
279
101.5
Eo for the cell, Zn [Zn2+ (aq)] [Cu2+(aq)] Cu is 1.10 V at 25oC. The equilibrium constant for the reaction,
10-37
10-28
10-18
10-17
On heating one end of a piece of a metal, the other end becomes hot because of.
Energised electrons moving to the other end.
Resistance of the metal.
Mobility of atoms in the metal.
Minor perturbation in the energy of atoms
