Advertisements
Advertisements
प्रश्न
Cell equation: \[\ce{A + 2B^- -> A^{2+} + 2B}\]
\[\ce{A^{2+} + 2e^- -> A}\] E0 = +0.34 V and log10 k = 15.6 at 300 K for cell reactions find E0 for \[\ce{B^+ + e^- -> B}\]
विकल्प
0.80
1.26
– 0.54
– 10.94
Advertisements
उत्तर
0.80
Explanation:
\[\ce{A + 2B^- -> A^{2+} + 2B}\]
Half reaction anode: \[\ce{A -> A^2+ + 2e^-}\]
`"E"_"ox"^0` = –0.34 V ........[Given: \[\ce{A^{2+} + 2e^- -> A}\] E0 = +0.34 V]
Cathode: \[\ce{2B^+ + 2e^- -> 2B}\] `"E"_"red"^0` = ?
log10 K = 156; T = 300 K; n = 2;
F = 96500 C
R = 8.314 JK−1 mol−1
∆G° = – 2.303 RT log K
∴ nFE° = – 2.303 RT log K
`"E"_"cell"^0 = (2.303 "RT" log "K")/("nF")`
= `(2.303 xx 8.314 xx 300 xx 15.6)/(2 xx 96500)`
= 0.4643 V
`"E"_"cell"^0 = "E"_"ox"^0 + "E"_"red"^0`
`"E"_"red"^0 = "E"_"cell"^0 + "E"_"ox"^0`
∴ 0.4643 – (–0.34)
= 0.4643 + 0.34
= 0.8043
= 0.80 V
APPEARS IN
संबंधित प्रश्न
Derive a relation between ΔH and ΔU for a chemical reaction. Draw neat labelled diagram of calomel electrode. Resistance and conductivity of a cell containing 0.001 M KCI solution at 298K are 1500Ω and 1.46x10-4 S.cm-1 respectively.
In the electrochemical cell: Zn|ZnSO4 (0.01 M)||CuSO4 (1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that CuSO4 changed to 0.01 M, the emf changes to E2. From the above, which one is the relationship between E1 and E2?
Define cathode
Describe the electrolysis of molten NaCl using inert electrodes.
For the cell \[\ce{Mg_{(s)}|Mg^{2+}_{( aq)}||Ag^+_{( aq)}|Ag_{(s)}}\], calculate the equilibrium constant at 25°C and maximum work that can be obtained during operation of cell.
Given: \[\ce{E^0_{{Mg^{2+}|Mg}}}\] = −2.37 V and \[\ce{E^0_{{Ag^{+}|Ag}}}\] = 0.80 V
Write a note on sacrificial protection.
Depict the galvanic cell in which the cell reaction is \[\ce{Cu + 2Ag^+ -> 2Ag + Cu^{2+}}\]
Match the terms given in Column I with the items given in Column II.
| Column I | Column II |
| (i) Λm | (a) intensive property |
| (ii) ECell | (b) depends on number of ions/volume |
| (iii) K | (c) extensive property |
| (iv) ∆rGCell | (d) increases with dilution |
If 0.5 amp current is passed through acidified silver nitrate then in 100 minutes the mass of silver, deposite on cathode is (eq. wt. of silver nitrate + 108).
Which of the following is incorrect?
