NEET Chemistry Electrochemistry Class 12 Questions
202 questions
For the cell reaction : 2Cu⁺(aq) → Cu(s) + Cu²⁺(aq), the standard cell potential is 0.36 V. The equilibrium constant for the reaction is
Given below are half-cell reactions: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O; E° = +1.510 V 1/2 Ω₂ + 2H⁺ + 2e⁻ → H₂O₂; E° = +1.223 V Will the permanganate ion, MnO₄⁻ liberate O₂ from water in the presence of an acid?
Using the data given below find out the strongest reducing agent. E° Cr₂O₇²⁻/Cr³⁺ = 1.33V E° Cl₂/Cl⁻ = 1.36V E° MnO₄⁻/Mn²⁺ = 1.51V E° Cr³⁺/Cr = -0.74V
The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is ......
Reduction potentials of some ions are given below. Arrange them decreasing order of oxidising power.
The cell in which the following reaction occurs: 2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(s) has E°cell = 0.236 V at 298 K. The equilibrium constant of the cell reaction is
E° cell = 1.1 V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in this cell?
Given E°Ag⁺/Ag = +0.80 V ; E°Cu²⁺/Cu = +0.34 V ; E°Fe³⁺/Fe²⁺ = +0.76 V ; E°Ce⁴⁺/Ce³⁺ = +1.60 V Which of the following statements is not correct?
Λₘ⁰ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm² mol⁻¹, respectively. If the conductivity of 0.001 M HA is 5 × 10⁻⁵ S cm⁻¹, degree of dissociation of HA is
If the conductance and specific conductance of a solution are same, then its cell constant is equal to:
E° value of Ni²⁺/Ni i.25 V and Ag⁺/Ag is +0.80 V. If a cell is made by taking the two electrodes what is the feasibility of the reaction?
A weak monobasic acid is 5% dissociated in 0.01 mol dm⁻³ solution. Limiting molar conductivity of acid at infinite dilution is 4 × 10⁻² Ω⁻¹ m² mol⁻¹. What will be the conductivity of 0.05 mol dm⁻³ solution of the acid?
The specific conductivity of N/10 KCl solution at 20°C is 0.0212 Ω⁻¹ cm⁻¹ and the resistance of the cell containing this solution at 20°C is 55 Ω. The cell constant is
An electric charge of 5 Faradays is passed through three electrolytes AgNO₃, CuSO₄ and FeCl₃ solution. The grams of each metal liberated at cathode will be
The number of correct statements from the following is (A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes. (B) The number of ions per unit volume that carry current in a solution increase on dilution. (C) Molar conductivity increases with decrease in concentration. (D) The variation in molar conductivity is different for strong and weak electrolytes. (E) For weak electrolytes, the change in molar conductivity with dilution is due to decrease in degree of dissociation.
Mark the correct choice of electrolytes represented in the graph.
The equation that is incorrect is
E° values for half cell reactions are given below : Cu²⁺ + e⁻ → Cu⁺ ; E° = 0.15 V Cu²⁺ + 2e⁻ → Cu ; E° = 0.34 V What will be the E° of the half-cell : Cu⁺ + e⁻ → Cu ?
Given :
Co³⁺ + e⁻ → Co²⁺ ; E° = +1.81 V
Pb⁴⁺ + 2e⁻ → Pb²⁺ ; E° = +1.67 V
Ce⁴⁺ + e⁻ → Ce³⁺ ; E° = +1.61 V
Bi³⁺ + 3e⁻ → Bi ; E° = +0.20 V
Oxidizing power of the species will increase in the order :
E° values of some redox couples are given below. On the basis of these values choose the correct option. E° values : Br₂/Br⁻ = + 1.90 ; Ag⁺/Ag(s) = + 0.80 ; Cu²⁺/Cu(s) = +0.34 ; I₂(s)/I⁻ = + 0.54 V
Which of the statements about solutions of electrolytes is not correct? (1) Conductivity of solution depends upon size of ions. (2) Conductivity depends upon viscosity of solution. (3) Conductivity does not depend upon solvation of ions present in solution. (4) Conductivity of solution increases with temperature.
For a cell involving one electron, E°cell = 0.59 V at 298 K, the equilibrium constant for the cell reaction is Given that F = 2.303RT at T = 298 K
Assertion: Zinc displaces copper from copper sulphate solution. Reason : The E° at 298 K of Zn is –0.76 V and that of Cu is +0.34 V.
Which of the following statements is correct? (1) Ecell and ΔG of cell reaction both are extensive properties. (2) Ecell and ΔG of cell reaction both are intensive properties. (3) Ecell is an intensive property while ΔG of cell reaction is an extensive property. (4) Ecell is an extensive property while ΔG of cell reaction is an intensive property.
The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.
The molar conductivity is maximum for the solution of concentration
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.
Which of the following is the cell reaction that occurs when the following half-cells are combined? I₂ + 2e⁻ → 2I⁻ (1 M) ; E° = +0.54 V Br₂ + 2e⁻ → 2Br⁻ (1 M) ; E° = +1.09 V
What happens to the conductivity of a solution when the concentration of the electrolyte decreases?
What is the electrical potential of the Daniell cell when the concentration of Zn²⁺ and Cu²⁺ ions is unity?
What is the cell potential measured in?
What is the relationship between the charge passed and the stoichiometry of the electrode reaction in an electrolytic cell?
What is the primary factor that determines the conductivity of electrolytic solutions?
What is the reaction that occurs at the cathode in an electrolytic cell consisting of copper strips in copper sulfate solution?
What does Kohlrausch's law of independent migration of ions state about the limiting molar conductivity of an electrolyte?
What happens to the conductivity of a solution as its concentration decreases?
What is the unit of electrical resistance?
What is the main principle governing the conductance of electricity in electrolytic solutions?
What is the unit of electrical resistance in SI base units?
Which of the following statements about electrolysis and electrode potentials is correct?
Which of the following statements about electrochemical cells is correct?
Which of the following statements regarding galvanic cells and batteries is correct?
Which of the following statements about electrochemical cells is correct?
Which of the following statements about electrochemical cells is correct?
Which of the following statements about galvanic and electrolytic cells is correct?
Which of the following statements about the electrolysis of silver ions is correct?
Which of the following combinations regarding molar conductivity and electrolyte behavior is correct?
Which of the following combinations correctly describes the relationship between standard electrode potential and the stability of species?
Which of the following statements about electrochemical cells is correct?
Which of the following statements about electrochemical cells and their reactions is correct?
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