JEE Questions for Chemistry Electrochemistry Quiz 9 - MCQExams.com

The one that is a good conductor of electricity in the following list of solids is
  • Sodium chloride
  • Graphite
  • Diamond
  • Sulphur

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    Chemistry-Electrochemistry-3375.png

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Which one of the following will increase the voltage of the cell
Sn(s) + 2Ag+(aq) → Sn2+(aq) + 2Ag(s)?
  • Increase in the size of the silver rod
  • Increase in the concentration of Sn2+ ions
  • Increase in the concentration of Ag+ ions
  • None of the above.
If same amount of electricity is passed through aqueous solution of AgNO3 and CuSO4 and the number of Ag and Cu atoms deposited are x and y respectively. Then.
  • x = y
  • x < y
  • y = 2x
  • x = 2y
The cathode reaction in electrolysis of dilute H2SO4 with platinum electrodes is
  • oxidation
  • reduction
  • both
  • neutralisation
Which of the following plots represents correctly variation of equivalent conductance (∧ ) with dilution for a strong electrolyte ?

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    Chemistry-Electrochemistry-3380.png

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The cathode in a galvanic cell and electrolytic cell is
  • Negatively charged in both cases
  • Positively charged in both cases
  • Positively charged in galvanic cell but negatively charged in an electrolytic cell
  • Negatively charged in a galvanic cell but positively charged in an electrolytic cell.
Consider the reaction Mn+ (aq) + ne- → M (s) .The standard reduction potential values of the elements M1, M2 and M3 are – 0.34 V, – 3.05 V and – 1.66 V respectively, The order of their reducing power will be
  • M1 > M2 > M3
  • M3 > M2 > M1
  • M1 > M3 > M2
  • M2 > M3 > M1
Which one of the following statements is not applicable to electrolytic conductors?
  • New products show up at the electrodes
  • Ions are responsible for carrying the current
  • Show a positive temperature coefficient for conductance
  • A single stream of electrons flows from cathode to anode
When a solution of an electrolyte is heated, the conductance of the solution.
  • increases because number of molecules of the electrolyte increases
  • decreases because of the increased heat
  • decreases because the dissociation of the electrolyte is suppressed
  • increases because the electrolyte is dissociated more
It half cell reaction A + e‒ → A‒ has a large negative reduction potential, it follows that
  • A is readily reduced
  • A is readily oxidized
  • A‒ is readily reduced
  • A‒ is readily oxidized
The standard reduction potentials at 25o C of Li+ /Li, Ba2+ /Ba, Na+ /Na and Mg2+ / Mg are ‒3.03, ‒2.73, ‒2.71, and ‒ 2.37 Volt respectively, which one of the following is the strongest oxidizing agent ?
  • Na+
  • Li+
  • Ba2+
  • Mg2+
If the number of moles of electrons involved in a reaction is doubled by multiplying all of the species appearing in the overall reaction by 2 then the
  • potential is halved
  • potential is doubled
  • potential is unchanged
  • potential is squared

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In the reaction : Cu(s) + 2Ag+(aq) → Cu2+(aq) + Ag(s). The reduction half cell reaction is
  • Cu + 2e‒ → Cu2+
  • Cu ‒ 2e → Cu2+
  • Ag+ + e‒ → Ag
  • Ag ‒ e → Ag+
The standard reduction potential values of the three metallic cations X,Y and Z are 0.52, – 3.03 and – 1.18 V respectively. The order of reducing power of the corresponding metals is
  • Y > Z > X
  • X > Y >Z
  • Z > Y > X
  • Z > X > Y

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    Chemistry-Electrochemistry-3390.png

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A gas X at 1 atm is bubbled through a solution containing a mixture of 1MY− and 1MZ− at 25oC. If the reduction potential is Z > Y > X, then
  • Y will oxidise X and not Z
  • Y will oxidise Z and not X
  • Y will oxidise both X and Z
  • Y will reduce both X and Z
The standard reduction potentials at 298 K for the following half reactions are given against each
Chemistry-Electrochemistry-3399.png
  • Zn (s)
  • Cs (s)
  • H2 (g)
  • Fe3+ (aq)

Chemistry-Electrochemistry-3400.png
  • M + X → M+ + X‒ is the spontaneous reaction
  • M+ + X‒ → M + X is the spontaneous reaction
  • Ecell = 0.77V
  • Ecell = ‒0.77V
In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode, it forms sodium amalgam. This is because
  • Hg is more inert than pt
  • More voltage is required to reduce H+ at Hg than at Pt
  • Na is dissolved in Hg while it does not dissolve in Pt
  • Conc. of H+ ions is larger when Pt electrode is taken
Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half- cell reactions and their standard potentials are given below:
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    Chemistry-Electrochemistry-3404.png

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Conductivity (unit seamen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then the unit of constant of proportionality is
  • Sm mol-1
  • Sm2 mol-1
  • S-2 m2 mol
  • S2 m2 mol-2
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are
Chemistry-Electrochemistry-3409.png
  • (a)
  • (b)
  • (c)
  • (d)

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  • Carbon can oxidise zinc
  • Oxidation of carbon is not possible
  • Oxidation of zinc is not feasible
  • Zinc can oxidise carbon
In the electrolytic cell, flow of electrons is from
  • cathode to anode in the solution
  • cathode to anode through external supply
  • cathode to anode through internal supply
  • anode to cathode through internal supply
The cell reaction of the galvanic cell Cu(s) |Cu2+ (aq)| |Hg2+ (aq)| Hg(l) is
  • Hg + Cu2+ → Hg2+ + Cu
  • Hg + Cu2+ → Hg+ + Cu+
  • Cu + Hg → CuHg
  • Cu + Hg2+ → Cu2+ + Hg
The conductivity of a saturated solution of BaSO4 is 3.06 × 10-6 Ohm-1 cm-1 and its equivalent conductance is 1.53 ohm-1 cm2 equiv-1 - The ksp for BaSO4 will be
  • 4 × 10-12
  • 2.5 × 10-9
  • 2.5 × 10-13
  • 4 × 10-6
A conductivity cell having cell constant 8.76 cm-1placed in 0.01 M solution of an electrolyte offered a resistance of 10000 ohms. What is the specific conductance of the electrolyte?
  • 8.76 × 104 ohm-1 cm-1
  • 8.76 × 10-4 ohm-1 cm-1
  • 8.76 × 10-2 ohm-1 cm-1
  • 8.76 × 102 ohm-1 cm-1
0:0:1


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