Electrochemistry Test

Electrochemistry

This is electrochemistry Test-03 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S $cm^{–1}$. Calculate its molar conductivity.
  • A
    124.0 S $cm^2mol^{–1}$
    Correct
  • B
    120.0 S $cm^2mol^{–1}$
  • C
    122.0 S $cm^2mol^{–1}$
  • D
    129.0 S $cm^2mol^{–1}$
2
The resistance of a conductivity cell containing 0.001M KCl solution at 298 K is 1500 Ω. What is the cell constant if conductivity of 0.001M KCl solution at 298 K is 0.146 × 10–3 S $cm^–1$.
  • A
    0.229 $cm^{–1}$
  • B
    0.219 $cm^{–1}$
    Correct
  • C
    0.239 $cm^{–1}$
  • D
    0.209 $cm^{–1}$
3
Conductivity of 0.00241 M acetic acid is 7.896 × $10^{–5}$ S $cm^{–1}$. If $\Delta _m^o$ for acetic acid is 390.5 S $cm^2mol^{–1}$, what is its dissociation constant?
  • A
    1.95 × $10^{–5}$
  • B
    2.05 × $10^{–5}$
  • C
    1.85 × $10^{–5}$
    Correct
  • D
    1.75 × $10^{–5}$
4
How much charge is required for the reduction of 1 mol of $Al^{3+}$ to Al?
  • A
    6F
  • B
    5F
  • C
    4F
  • D
    3F
    Correct
5
How much charge is required for the reduction of 1 mol of $Cu^{2+}$ to Cu?
  • A
    2F
    Correct
  • B
    6F
  • C
    1F
  • D
    3F
6
How much charge is required for the reduction of 1 mol of $MnO_4^ - $ to $Mn^{2+}$?
  • A
    5F
    Correct
  • B
    4F
  • C
    6F
  • D
    3F
7
How much electricity in terms of Faraday is required to produce 20.0 g of Ca from molten CaCl2?
  • A
    1.3F
  • B
    1.2F
  • C
    1F
    Correct
  • D
    0.8F
8
How much electricity in terms of Faraday is required to produce 40.0 g of Al from molten $Al_2O_3$?
  • A
    4.84F
  • B
    4.64F
  • C
    4.54F
  • D
    4.44F
    Correct
9
How much electricity is required in coulomb for the oxidation of 1 mol of $H_2O$ to $O_2$?
  • A
    192121 C
  • B
    192974 C
    Correct
  • C
    194974 C
  • D
    191323 C
10
How much electricity is required in coulomb for the oxidation of 1 mol of FeO to $Fe_2O_3$?
  • A
    96000C
  • B
    96487C
    Correct
  • C
    95550C
  • D
    95000C
11
A solution of Ni($NO_3$)2 is electrolyzed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?
  • A
    1.203g
  • B
    1.603g
  • C
    1.803g
    Correct
  • D
    1.403g
12
Three electrolytic cells A,B,C containing solutions of ZnSO4, AgNO3 and CuSO4, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell. How long did the current flow? What mass of copper and zinc were deposited?
  • A
    14.40 min, Copper 0.427g, Zinc 0.437 g
    Correct
  • B
    15.10 min, Copper 0.452g, Zinc 0.437 g
  • C
    13.10 min, Copper 0.403g, Zinc 0.437 g
  • D
    16.20 min, Copper 0.487g, Zinc 0.437 g
13
Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.3 S $m^{–1}$. If resistance of the 0.4 M solution of the same electrolyte is 260 Ω, its molar conductivity is
  • A
    Option A
  • B
    Option B
    Correct
  • C
    Option C
  • D
    Option D
14
The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
  • A
    $10^{20}$
  • B
    $10^{15}$
  • C
    $10^{30}$
    Correct
  • D
    $10^{25}$
15
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
  • A
    100% ionization of electrolyte at normal dilution
  • B
    increase in both i.e. number of ions and ionic mobility of ions
  • C
    increase in ionic mobility of ions
    Correct
  • D
    increase in number of ions