Revisal Problems (Past 13 Year) JEE Main (Electrochemistry) - JEE MCQ

For aqueous NH₃(NH₄OH), at 298 K
Molar conductance at infinite dilution = 2.38 x 10^-2 S m² mol^-1.
K_b (ionisation constant) = 1.6x 10^-5

What is the molar conductance at 0.01 M NH₄OH?

Electrode potential for Mg electrode varies according to the equation at 298 K

(E_cell - E°_cell) has maximum value for spontaneous reaction in

For strong electrolytes,the values of molar conductivity at infinite dilution are given below:

The reduction potential of hydrogen half-cell will be negative if

At 298 K,given  

Thus, stability constant of the complex [Cu(NH₃)₄]²⁺ is   

For the half-cell

At pH = 2,electrode potential is   

The hydrazine fuel cell is based on the reaction,

The reduction of oxygen gas in 1 M aqueous acid is represented by

The potential for this reaction at physiological pH where [H⁺] = 1 x 10^-7 M,and the partial pressure of O₂ is 1 atm,will be closest to which value?  

K_sp of AI(OH)₃ = 1.0 x 10^-33 and E°_A|³⁺/A| = -1.66 V

Reduction potential of the above couple at pH = 14 is

Consider the half-cell reactions :

If Fe²⁺ and H₂O₂ are mixed ,Which reaction is more likely?  

If for the half-cell reactions, E° values are known

Predict which exists in aqueous solution? 

For the half-cell

Hence, E^° for the disproportionation reaction 2Cu⁺→ Cu²⁺ + Cu would be

Consider the following half-cell reactions :

What combination of two half-cells would result in a cell with the largest potential?   

In a cell that utilises the reaction
Mg(s)+ 2H⁺(aq) → Mg²⁺(aq)+ H₂(g)

addition of dil. H₂SO₄ to cathode compartment will

The standard reduction potentials for Zn²⁺ /Zn, Ni²⁺/Ni and Fe²⁺ /Fe are -0.76,-0.23 V and -0.44 V respectively.The reaction

will be spontaneous when     

The cell Zn| Zn²⁺(1 M) ||Cu²⁺(1 M) | Cu, E°_cell = 1.10 V  was allowed to be discharged at 298K. Thus at a time when,E_cell = 0.8634 V,log [Zn²⁺] /[Cu²⁺] is  

Given the data at 298 K,

Thus, solubility product of Agl(s) is (given, 

The conductivity of a solution of 0.001 mol dm^-3 Na₂SO₄ is 2.6 x 10^-2 S m^-1.Given that the molar conductivity of Na⁺ is 5.0 x 10^-3 S m² mol^-1 ,thus molar conductivity of sulphate ion is (In S m² mol^-1)

At 25^°C,limiting equivalent conductances (in Ω^-1 cm² equiv^-1) of BaCl₂ ,H₂SO₄ and HCl respectively are 100,250 and 150.Specific conductance (conductivity) of saturated aqueous BaSO₄ solution is 1 x 10^-6 Ω^-1 cm^-1.Thus solubility product of BaSO₄ solution is

Cell constant (C) dependent of resistance (R) between two electrodes is shown by which of the following graph in terms of logR and logC?

The limiting molar conductivities for NaCI, KBr and KCI are 126,152 and 150 S cm² mol^-1, respectively. The for NaBr is (in S cm² mol^-1) 

Following solutions having equal ionisation have been provided

I. 0.01 M HCI,
II. 0.01 MH₂SO₄,
III. 0.01 M H₃PO₄

Maximum value of molar conductanceand equivalent conductanceare of  

The resistivity of aluminium is 2.824 x 10^-8 Ωm. Thus,conductance across a piece of aluminium wire,that is 2.0 mm in diameter and 1.00 m long is (assume current= 1.25 A)

Electrolysis products in gaseous state at cathode and anode are same when reactant is

Aluminium oxide may be electrolysed at 1270 K to form Al metal (atomic mass = 27 u, 1F = 96500 C)  

To prepare 5.12 kg of Al metal by this method,it would require

For an electrosynthesis of a substance, sign of ΔG and E_cell should be