JEE Questions for Chemistry Electrochemistry Quiz 6 - MCQExams.com

The cell, Zn | Zn2+ (1 M) || Cu2+ (1 M) | Cu (Eocell = 1.10V), was allowed to be completely discharged at 298 K. The relative concentration of Zn2+to
Chemistry-Electrochemistry-3310.png
  • antilog (24.08)
  • antilog (37.3)
  • 1037.3
  • 9.65 × 104
Given standard electrode potentials
Fe2+ + 2e- → Fe Eo = - 0.440V
Fe3+ + 3e- → Fe Eo = - 0.036 V
the standard electrode potential (Eo) for
Fe3+ + e- → Fe2+ is
  • +0.722 V
  • -0.772 V
  • +0.417 V
  • -0.414 V
The standard Eored values of A, B and C are + 0.68 V, - 2.54 V, - 0.50 V respectively. The order of their reducing power is
  • A > B > C
  • A > C > B
  • C > B > A
  • B > C > A
EMF of hydrogen electrode in term of pH is (at 1 atm pressure)

  • Chemistry-Electrochemistry-3313.png
  • 2)
    Chemistry-Electrochemistry-3314.png

  • Chemistry-Electrochemistry-3315.png

  • Chemistry-Electrochemistry-3316.png
Which one following nitrates will leave behind a metal on strong heating?
  • Ferric nitrate
  • Copper nitrate
  • Manganese nitrate
  • Silver nitrate
The standard oxidation potentials of Zn, Cu, Ag and Ni electrodes are + 0.76, - 0.34, - 0.80 and + 0.25 V respectively. Which of the following reaction will provide maximum voltage?
  • Cu + 2 Ag+ (aq) → Cu2+ (aq) + 2 Ag
  • Zn + 2 Ag+ (aq) → Zn2+ (aq) + 2 Ag
  • H2 + Ni2+ (aq) → 2H+ (aq) + Ni
  • Zn + Cu2+ (aq) → Zn2+ (aq) + Cu
  • Zn + 2H+ (aq) → Zn2+ (aq) + H2
In the electrochemical reaction,
2Fe3+ + Zn → Zn2+ + 2Fe2+
increasing the concentration of Fe2+
  • increases cell emf
  • increases the current flow
  • decreases the cell emf
  • alter the pH of the solution
For the redox reaction,
Zn(s) + Cu2+ (0.1 M) → Zn2+ (1 M) + Cu(s) talking place in a cell, Eocell is 1.10 V. Eocell for the cell will be
Chemistry-Electrochemistry-3318.png
  • 2.14 V
  • 1.80 V
  • 1.07 V
  • 0.82 V
Calculate the emf of the cell
Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag(s)
Chemistry-Electrochemistry-3319.png
  • +0.46 V
  • +1.14 V
  • +0.57 V
  • -0.46 V
Given the data at 25oC.
Ag + I- → AgI + e- ; Eo = 0.152 V
Ag → Ag+ + e-, Eo = - 0.800V
What is the value of log Ksp for AgI ?

Chemistry-Electrochemistry-3321.png
  • -8.12
  • +8.612
  • -37.83
  • -16.13
The reduction electrode potential, E of 0.1 M solution of M+ ions (ERP = -2.36 V) is
  • -482 V
  • -2.41 V
  • +2.41 V
  • None of these
Which of the following statements are correct concerning redox properties?
I. A metal M for which E° for the half reaction Mn+ + ne- = M is very negative will be a good reducing agent.
II. The oxidising power of the halogens decreases from chlorine to iodine.
III. The reducing power of hydrogen halides increases from hydrogen chloride to hydrogen iodide.
  • I, II and III
  • I and II
  • Only I
  • II and III
  • Only III
Given the standard reduction potentials
Zn2+/Zn = -0.74 V, Cl2 / Cl- = 1.36 V
H+/ 1/2 H2 = 0 V and Fe2+/ Fe3+ = 0.77 V
The order of increasing strength as reducing agent is
  • Cl-, Zn, H2, Fe2+
  • H2, Zn, Fe2+, Cl-
  • Cl-, Fe2+, Zn, H2
  • H2, Fe2+, Cl-, Zn
  • Cl-, Fe2+, H2, Zn
The metal used to recover copper from a solution of CuSO4 is
  • Fe
  • He
  • Na
  • Ag
The standard reduction potentials of Zn2+|Zn, Cu2+|Cu and Ag+|Ag are respectively - 0.76, 0.34 and 0.8 V. The following cells were constructed .
I. Zn|Zn2+||Cu2+|Cu
II. Zn|Zn2+||Ag+|Ag
III. Cu|Cu2+||Ag+|Ag
what is the correct order of Eocell of these cell ?
  • II > III > I
  • II > I > III
  • I > II > III
  • III > I > II
The rusting of iron takes place as follows
2H+ + 2e- + 1/2 O2 → H2O (l); Eo = +1.23 V
Fe2+ + 2e- → Fe(s); Eo = - 0.44 V
Calculate ∆Go for the net process.
  • -322 KJ mol-1
  • -161 KJ mol-1
  • -152 KJ mol-1
  • -76 KJ mol-1
The standard reduction potential of the reaction ,
H2 O = e- → 1/2 H2 + OH at 298 K is
  • Eo = RT/F in Kw
  • Eo = - (Rt/k) In[pH2]1/2 [OH-]

  • Chemistry-Electrochemistry-3325.png
  • Eo =-(RT/F) in Kw
The oxidation potential values of A , B ,C and D are -0.03, + 0.108 V, - 0.07 V and + 0.1 V respectively. The non-spontaneous cell reaction takes place between
  • A and B
  • B and D
  • D and A
  • B and C
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)
  • 0.177 V
  • 0.087 V
  • 0.059 V
  • -0.177 V
The standard electrode potential is measured by
  • electrometer
  • voltmeter
  • pyrometer
  • galvanometer
Which of the following expression is correct?
  • ∆Go = nFEocell
  • ∆Go = +nFEocell
  • ∆Go = -2.303 RT nFEocell
  • ∆Go = -nF log Kc
The standard reduction potential of Zn and Ag in water at 298 K are, Zn2+ + 2e- ⇌ Zn; Eo = -0.76 V and Ag+ + e- ⇌ Ag; Eo = +0.80 V. Which of the following reactions take place?
  • Zn2+ (aq) + 2Ag (s) → 2Ag+ (aq) + Zn(s)
  • Zn(s) + 2Ag+ (aq) → Zn2+ (aq) + 2Ag(s)
  • Zn2+ (aq) + Ag+ (aq) → Zn(s) + Ag(s)
  • Zn(s) + Ag(s) → Zn2+ (aq) + ag+ (aq)
A standard hydrogen electrode has zero electrode potential because
  • hydrogen is easier to oxidise
  • this electrode potential is assumed to be zero
  • hydrogen atom has only one electron
  • hydrogen is the lightest element
During charging of lead storage battery, the reaction occurring at the anode is
  • Pb2+ + 2e- → Pb
  • Pb → Pb2+ + 2e-
  • PbSO4 + 2H2O → 2PbO2 + 4H+ + SO2-4 + 2e-
  • Pb2+ + SO2-4 → PbSO4
The electrochemical cell stops working after sometime because
  • electrode potential of both the electrodes becomes zero
  • electrode potential of both the electrodes becomes equal
  • one of the electrodes is eaten away
  • the cell reaction gets reversed
What flows in the internal circuit of a galvanic cell?
  • Ions
  • Electrons
  • Electricity
  • Atoms
Galvanic cell is a device in which
  • chemical energy is converted into electrical energy
  • electrical energy is converted into chemical energy
  • chemical energy is seen in the form of heat
  • thermal energy from an outside source is used to drive the cell reaction
In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
  • generate heat
  • create potential difference between the two electrodes
  • produce high purity water
  • remove adsorbed oxygen from electrode surfaces
Which of the following statements (or equation) is correct ?
  • The units of cell emf are V. cm-1
  • ∆G = nF/Ecell
  • In galvanic cell, chemical energy is transformed into electrical energy
  • Oxidation state of Mn in potassium permanganate is +6
The best way to prevent rusting of iron is
  • making it cathode
  • putting in saline water
  • Both (and (2)
  • None of these
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Chemistry Quiz Questions and Answers