31 Year NEET Previous Questions: Electrochemistry - 2 - Free MCQ Test

On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be [1992]

Which of the following is an insulator ? [1992]

The standard reduction poten tials at 25°C of
Li⁺/ Li, Ba ²⁺ / Ba, Na⁺ / Na
and Mg 2⁺ / Mg are – 3.03, – 2.73, – 2.71 and – 2.37 volt respectively. Which one of the following is the strongest oxidising agent? [1994]

The most durable metal plating on iron to protect against corrosion is [1994]

On heating one end of a piece of a metal, the other end becomes hot because of [1995]

If 0.5 amp current is passed through acidified silver nitrate solution for 100 minutes. The mass of silver deposited on cathode, is (eq.wt.of silver nitrate = 108) [1995]

An electr och emical cell is set up as: Pt; H₂ (1atm)|HCl(0.1 M) || CH₃COOH (0.1 M)| H₂ (1atm); Pt. The e.m.f of this cell will not be zero, because [1995]

On passing a current of 1.0 ampere for 16 min and 5 sec through one litre solution of CuCl₂, all copper of the solution was deposited at cathode. The strength of CuCl₂ solution was (Molar mass of Cu= 63.5; Faraday constant = 96,500 Cmol^–1) [1996]

Equivalent conductances of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91 ohm^–1 cm² respectively. The equivalent conductance of CH₃COOH at infinite dilution would be [1997]

If 0.01 M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm^–1, then its molar conductance in ohm^–1 cm² mol^–1 is [1997]

Eº for the cell, 

1.10 V at 25ºC. The equilibrium constant for the cell reaction:

 Standard potentials (Eº) for some half-reactions are given below :

 Eº = +1.45 V

Based on the above, which one of the following statements is correct ? [1997]

For the cell reaction, [1998] Cu²⁺ (C₁, aq) + Zn(s) = Zn²⁺ (C₂, aq) + Cu(s) of an electrochemical cell, the change in free energy, ΔG, at a given temperature is a function of

Without losing its concentration ZnCl₂ solution cannot be kept in contact with [1998]

What is the Eºcell for the reaction

at 25ºC if the equilibrium constant for the reaction is  1 × 10⁶? [1999]

Th e ionic conductan ce of Ba²⁺ an d Cl^– are respectively 127 and 76 ohm^–1 cm² at infinite dilution. The equivalent conductance (in ohm^–1 cm²) of BaCl₂ at infinite dilution will be : [2000]

Cu ⁺_aq is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction : [2000]

choose correct Eº for above reaction if Eº Cu²⁺/Cu = 0.34 V and Eº Cu²⁺/Cu⁺ = 0.15 V

 Specific conductance of a 0.1 N KCl solution at 23ºC is 0.012 ohm^–1 cm^–1. Resistance of cell containing the solution at same temperature was found to be 55 ohm. The cell constant is [2000]

Standard electrode potentials are : Fe⁺²/Fe [ Eº = –0.44]; Fe⁺³/Fe⁺²  Eº = + 0.77 ; If Fe⁺², Fe⁺³ and Fe blocks are kept together, then [2001]

The most convenient method to protect the bottom of ship made of iron is [2001]

In the silver plating of copper, K[Ag(CN)₂] is used instead of AgNO₃. The reason is [2002]

Which reaction is not feasible? [2002]

In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam. This is because [2002]

The e.m.f. of a Daniell cell at 298 K is E₁.

When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the e.m.f. changed to E₂.What is the relationship between E₁ and E₂? [2003]

On the basis of the information available from the reaction

the minimum e.m.f required to carry out an electrolysis of Al₂O₃ is (F = 96500 C mol^–1)

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be    (Given F = 96500 C mol^–1; R = 8.314JK^{– 1}mol^–1)[2004]

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be [2005]

If , the standard EMF of the reaction Fe + 2Fe³⁺ → 3Fe²⁺  will be [2006]

A hypoth etical electrochemical cell is shown below [2006] The emf measured is +0.20 V. The cell reaction is  

The efficiency of a fuel cell is given by [2007]