Class 12 Chemistry CBSE Electrochemistry Board Questions
Here we provide Class 12 chemistry important notes,board questions and predicted questions with Answers for chapter Electrochemistry. These important notes,board questions and predicted questions are based on CBSE board curriculum and correspond to the most recent Class 12 chemistry syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
2020
Q1
The molar conductivity of NaCl, CH3COONa and HCl at infinite dilution is 126.45, 91.0 and
426.16 ohm-1 cm2 mol-1 respectively. Calculate the molar
conductivity (λ∞m ) for CH3COOH at infinite dilution.
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Q2
Calculate the emf and △G for the given cell at 25°C: Cr(s)/Cr3+ (0.1 M)
// Fe2+ (0.01 M)/ Fe(s) Given: E0Cr3+/Cr =
0.74V , E0Fe2+/Fe = - 0.44 V (1 F = 96500 C, R = 8.314 J
K-1 mol-1)
40.95 S cm2 mot
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OR
Q3
Calculate the degree of dissociation (∞) of acetic acid, if its molar conductivity
(λm) is 39.05 S cm2 mol -1 Given
(λ0H+) = 349.6 S cm2 mol-1 and
(λ0CH3COO-) = 40.95 S cm2
mol-1
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solutions
2019
Q4
Calculate the mass of silver deposited at cathode when a current of 2 amperes is passed through a
solution of a AgNO3 for 15 minutes (atomic weight of Ag = 108, 1 F = 96,500 C)
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Q5
Calculate the emf and △G0 for the cell reaction at 298 K
Mg(s) | Mg2+(0.1M) || Cu2+(0.01 M) |Cu(s)
Given E0cell = 2.71 V
1 F = 96,500 C
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Mg(s) | Mg2+(0.1M) || Cu2+(0.01 M) |Cu(s)
Given E0cell = 2.71 V
1 F = 96,500 C
solutions
OR
Q6
(i) Define the following terms :
(1) specific conductance
(2) Kohlrausch's law
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(1) specific conductance
(2) Kohlrausch's law
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Q7
The resistance of a conductivity cell containing 0.01 M KCl solution of 298 K is 1500 ohm. What is
the cell constant and molar conductivity of 0.01 M KCl solution , if the conductivity of this
solution is 0.146 x 10-3 ohm-1 cm-1 at 298 K ?
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2018
Q8
(i) Calculate the emf and △G0 for the cell reaction at 25oC :
Zn(s) | Zn2+(aq) (0.1 M) || Cd2+(aq) | Cd(s)(0.01 M)
Given E0Zn2+/ Zn = -0.763 and E0Cd2+/ Cd = -0.403 V
1 F = 96,500 C
(ii) Define the following terms :
(1) equivalent conductivity
(2) corrosion of metals
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Zn(s) | Zn2+(aq) (0.1 M) || Cd2+(aq) | Cd(s)(0.01 M)
Given E0Zn2+/ Zn = -0.763 and E0Cd2+/ Cd = -0.403 V
1 F = 96,500 C
(ii) Define the following terms :
(1) equivalent conductivity
(2) corrosion of metals
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OR
Q9
(i) The specific conductivity of a solution containing 5 g of anhydrous BaCl2 (molar
weight = 208) in 1000 cm3 of a solution is found to be 0.0058 ohm-1
cm-1 calculate the molar and equivalent conductivity of the solution.
(ii) What is electrochemical series? How it is useful in predicting whether metal can liberate hydrogen from acid or not ?
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(ii) What is electrochemical series? How it is useful in predicting whether metal can liberate hydrogen from acid or not ?
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2017
Q10
Specific conductivity of 0.20 M solution of KCl at 8298 K is 0.025. Calculate its molar
conductivity.
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2016
Q11
Consider the following cell reaction at 298 K :
the standard reduction potentials (Eo) for Ag+/ Ag and Cd2+/Cd are 0.80 V and -0.40 V respectively
(1) Write the cell representation
(2) What will the emf of the cell if the concentration of Cd2+ 0.1 M and that of Ag2+ is 0.2 M
(3) Will the cell work spontaneously for the condition given in (2) above.
solutions
the standard reduction potentials (Eo) for Ag+/ Ag and Cd2+/Cd are 0.80 V and -0.40 V respectively
(1) Write the cell representation
(2) What will the emf of the cell if the concentration of Cd2+ 0.1 M and that of Ag2+ is 0.2 M
(3) Will the cell work spontaneously for the condition given in (2) above.
solutions
Q12
What is a buffer solution? How it is prepared? Explain the buffer action of a basic buffer with a
suitable example.
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Q13
Explain the following :
(i) When NaCl is added to AgNO3 solution of white precipitate is formed
(ii) An aqueous solution of ammonium chloride is acidic in nature
solutions
(i) When NaCl is added to AgNO3 solution of white precipitate is formed
(ii) An aqueous solution of ammonium chloride is acidic in nature
solutions
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