31 Year NEET Previous Year Questions: Electrochemistry - 1 - NEET MCQ

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 K_eq ?[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]