Electrochemistry Test

Electrochemistry

This is electrochemistry Test-04 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
For the reduction of silver ions with copper metal the standard cell potential was found to be +0.46V at 25°C. The value of standard Gibbs energy, ΔG° wll be (F = 96500 C $mol^-1$)
  • A
    -89.0 kJ
    Correct
  • B
    -98.0 kJ
  • C
    -89.0 J
  • D
    -44.5 kJ
2
Which of the following electrolytic solutions has the least specific conductance?
  • A
    0.002 N
    Correct
  • B
    0.2 N
  • C
    2 N
  • D
    0.02 N
3
The highest electrical conductivity of the following aqueous solutions is of
  • A
    0.1 M chloroacetic acid
  • B
    0.1 M fluoroacetic acid
  • C
    0.1 M difluoroacetic acid
    Correct
  • D
    0.1 M acetic acid
4
Saturated solution of $KNO_3$ is used to make 'salt bridge' because
  • A
    $KNO_3$ is highly soluble in water
  • B
    velocity of $K^+$ is greater than that of $NO^{3-}$
  • C
    velocity of $NO^{3-}$ is greater than that of $K^+$
  • D
    velocity of both $K^+$ and $NO^{3-}$ are nearly the same
    Correct
5
Li occupies higher position in the electrochemical series of metals as compared to Cu since
  • A
    Li is smaller in size as compared to Cu
  • B
    the standard oxidation potential of $Li^+$/Li is lower than that of $Cu^{2+}$/Cu
  • C
    the standard reduction potential of $Cu^{2+}$/Cu is lower than that of $Li^+$/Li
  • D
    the standard reduction potential of $Li^+$/Li is lower than that of $Cu^{2+}$/Cu
    Correct
6
The standard reduction potential Eo for half reactions are The EMF of the cell reaction $Fe^{2+}$ + Zn = $Zn^{2+}$ + Fe is
Question 6 figure 1
  • A
    – 1.17 V
  • B
    +1.17 V
  • C
    + 0.35 V
    Correct
  • D
    -0.35 V
7
Consider the following cell reaction: And pH = 3, the cell potential at 25°C is
Question 7 figure 1
  • A
    1.87 V
  • B
    1.47 V
  • C
    1.57 V
    Correct
  • D
    1.77 V
8
Hydrogen gas is not liberated when the following metal is added to dil. HCl.
  • A
    Sn
  • B
    Mg
  • C
    Zn
  • D
    Ag
    Correct
9
Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milliampere current. The time required to liberate 0.01 mol of $H_2$ gas at the cathode is (1 Faraday = 96500 C $mol^{-1}$)
  • A
    Option A
  • B
    Option B
    Correct
  • C
    Option C
  • D
    Option D
10
The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V)
  • A
    -0.177 V
    Correct
  • B
    0.087 V
  • C
    0.059 V
  • D
    0.177 V
11
The emf of the above cell is 0.2905 V. Equilibrium constant for the cell reaction is
Question 11 figure 1
  • A
    $10^{0.32/0.0591}$
  • B
    $10^{0.26/0.0295}$
  • C
    $10^{0.32/0.0295}$
    Correct
  • D
    $e^{0.32/0.295}$
12
In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under S.T.P. conditions. The current to be passed is
  • A
    0.965 Amp
  • B
    1.93 Amp
  • C
    9.65 Amp
    Correct
  • D
    19.3 Amp
13
The one which decreases with dilution is
  • A
    specific conductance
    Correct
  • B
    equivalent conductance
  • C
    molar conductance
  • D
    conductance
14
The standard electrode potential for the half cell reactions are The e.m.f. of the cell reaction $Fe^{++}$ + Zn → $Zn^{++}$ + Fe is
Question 14 figure 1
  • A
    + 0.32 V
    Correct
  • B
    -1.20 V
  • C
    –0.32 V
  • D
    +1.20 V
15
Given Electrode potential E° for the reaction Cu2+ + e– → Cu will be
Question 15 figure 1
  • A
    0.38 V
  • B
    0.30 V
  • C
    0.52 V
    Correct
  • D
    0.90 V