The equilibrium constant of the reaction:
E° = 0.46 V at 298 K is [2007]
On the basis of the following E° values, the strongest oxidizing agent is : [2008]
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Kohlrausch’s law states that at : [2008]
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 E°cell for the pentane-oxygen fuel cell is : [2008]
Given: [2009]
Electrode potential, Eo for the reaction, will be :
Al 2O3 is reduced by electrolysisat low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol–1) [2009]
The equivalent conductance of solution ofa weak monobasic acid is 8.0 mhos cm2 and at infinite dilution is 400 mhos cm2. The dissociation constant of this acid is: [2009]
For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25°C. The value of standard Gibbs energy, ΔG0 will be (F = 96500 C mol –1)
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to: [2010]
Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al2 (SO4)3, Given that and are the equivalent conductances at infinite dilution of the respective ions? [2010]
Consider the following relations for emf of a electrochemical cell: [2010]
(i) emf of cell = (Oxidation potential of anode) – (Reduction potential of cathode)
(ii) emf of cell = (Oxidation potential of anode) + (Reduction potential of cathode)
(iii) emf of cell = (Reduction potential of anode) + (Reduction potential of cathode)
(iv) emf of cell = (Oxidation potential of anode) – (Oxidation potential of cathode)
Which of the above relations are correct?
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 : [2011]
The electrode potentials for [2011]
are + 0.15 V and + 0.50, respectively. The value of E° Cu 2+ / Cu will be :
Standard electrode potential for Sn4+ / Sn2+ couple is + 0.15 V and that for the Cr3+ / Cr couple is – 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be : [2011]
If the E°cell for a given reaction has a negative value, then which of the following gives the correct relationships for the values of ΔG° and Keq ?[2011]
A solution contains Fe2+, Fe3+ and I– ions. This solution was treated with iodine at 35°C. E° for Fe3+ / Fe2+ is + 0.77 V and E° for I2/2I– = 0.536 V.The favourable redox reaction is : [2011 M]
Limiting molar conductivity of NH4OH
is equal to : [2012]
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 : [2012 M]
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ? [NEET 2013]
At 25°C 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 or ionisation of ammonium hydroxide at the same concentration and temperature is :[NEET 2013]
A button cell used in watches function s as following
If half cell potentials are :
The cell potential will be : [NEET 2013]
How many grams of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u) [NEET Kar. 2013]
Consider the half-cell reduction reaction :
The E° for the reaction and possibility of the forward reaction are, respectively [NEET Kar. 2013]
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