Standard electrode potential for Sn^{4+} / Sn^{2+} couple is +0.15 V and that for the Cr^{3+}/Cr couple is -0.74. These two couples in their standard state are connected to make a cell. The cell potential will be
+0.89 V
+0.18 V
+1.83 V
+1.83 V
A solution contains Fe^{2+ }Fe^{3+}, and I^{-} ions. This solution was treated with iodine at 35^{o} C.E^{o} for Fe^{3+}/ Fe^{2+} is +0.77 V and E^{o} for I_{2}/ 2 I^{-} = 0.536 V. The favourable redox reaction is
I_{2} will be reduced to I^{-}
There will be No redox reaction
I^{-} will be oxidised to I_{2}
I^{-} will be oxidised to I_{2}
In qualitative analysis, the metals of group I can be separted from other ions by precipitating them as chloride salts. A solution initially contains Ag^{+} and Pb^{2+} at a concentration of 0.10 M. Aqueous HCl is added to this solution until the Cl^{-} concentration is 0.10 M. What will be the concentration of Ag^{+} and Pb^{2+} be at equilibrium? (K_{sp} for AgCl = 1.8 x 10^{-}^{10}, Ksp for PbCl_{2} = 1.7 x 10^{-5})
[Ag^{+}] = 1.8 x 10^{-7} M; [Pb^{2+}] = 1.7 x 10^{-6} M
[Ag^{+}] = 1.8 x 10^{-11} M; [Pb^{2+}] = 8.5 x 10^{-5} M
[Ag^{+}] = 1.8 x 10^{-9} M; [Pb^{2+}] = 1.7 x 10^{-3} M
[Ag^{+}] = 1.8 x 10^{-9} M; [Pb^{2+}] = 1.7 x 10^{-3} M
For the reaction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25^{o} C^{.} The value of standard Gibbs energy, ΔG^{o} will be (F = 96500 C mol^{-1} )
-89.0 kJ
-89.0 J
-44.5 kJ
-44.5 kJ
An increase in equivalent conductance of strong electrolyte with dilution is mainly due to
the increase in ionic mobility of ions
100% ionisation of electrolyte at normal dilution
the increase in both, ie, the number of ions and ionic mobility of ions
the increase in both, ie, the number of ions and ionic mobility of ions
Which of the following expression correctly represents the equivalent conductance at infinite dilution of Al_{2}(SO_{4})_{3.} Given that are the equivalent conductance at infinite dilution of the respective ions.
Consider the following relations for emf of an electrochemical cell
A) Emf of cell = (oxidation potential of anode) - (reduction potential of cathode)
B) Emf of cell = (oxidation potential of anode) - ( reducation potential of cathode)
C) Emf of cell = (oxidation potential of anode)- (reduction potential of cathode)
D) Emf of cell = (oxidation potential of anode) - (oxidation potential of anode)-(oxidation potential of cathode)
(C) and (A)
(A) and (B)
(C) and (D)
(C) and (D)
For vaporisation of water at 1 atm pressure, the values of ΔH and ΔS are 40.63 kJ mol^{-} and 108.8 JK^{-1} mol^{-1}, respectively. The temperature when Gibbs energy change (ΔG) for this transformation will be zero, is
273.14 K
393.4 K
373.4 K
373.4 K
Al_{2}O_{3} is reduced by electrolysis at low potentials and high currents. If 4.5 x 10^{4} An of current is passed through molten Al_{2}O_{3} for 6h, what mass of aluminium is produced? (Assume 100% current efficiency, at.mass of Al = 27 g mol^{-1})
9.0 x 10^{3} g
8.1 x 10^{4} g
2.4 x 10^{5} g
2.4 x 10^{5} g
The equivalent conductance of M/32 solution of weak monobasic acid is 8.0 ohm-cm^{2} and at infinite dilution is 400 ohm-cm^{2}. The dissociation constant of this acid is
1.25 x 10^{-5}
1.25 x 10^{-6}
6.25 x 10^{-4}
6.25 x 10^{-4}