JEE Questions for Chemistry Electrochemistry Quiz 7 - MCQExams.com

Several blocks of magnesium are fixed to the bottom of a ship to
  • keep away the sharks
  • make the ship lighter
  • prevent action of water and salt
  • prevent puncturing by under-sea rocks
The process of zinc-plating on iron sheet is known as
  • annealing
  • roasting
  • galvanisation
  • smelting
When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the anode.If the cathode is pulled out of the solution
  • the positive and negative ions will move towards the anode
  • the positive ions will start moving towards the anode; the negative ions will stop moving
  • the negative ions will continue to move towards the anode; the positive ions will stop moving
  • the positive and negative ions will start moving randomly
What is the standard cell potential for the cell Zn; Zn2+(1M); Cu2+ (1M); Cu? (Eo for Zn2+/Zn = –0.76, Eo for Cu2+/Cu = +0.34)
  • ‒ 0.76 + ( ‒ 0.34 ) = ‒ 0.42 V
  • ‒ 0.34 + 0.76 = + 0.42 V
  • 0.34 – (‒ 0.= + 1.10 V
  • ‒ 0.76 ‒ ( + 0.= ‒1.10 V
The standard reduction potential at 298 K for the following half reactions are given against each:
Chemistry-Electrochemistry-3328.png
  • Zn (s)
  • Cr (s)
  • H2 (g)
  • Fe2+ (aq)
The number of electrons involed in the reaction when a Faraday of electricity is passed through an electrolyte in solution is

  • Chemistry-Electrochemistry-3329.png
  • 96540

  • Chemistry-Electrochemistry-3330.png

  • Chemistry-Electrochemistry-3331.png
Faraday’s laws of electrolysis are related to
  • atomic number of the cation
  • atomic number of anion
  • equivalent weight of the electrolyte
  • speed of the cation
The amount of ion discharged during electrolysis is not directly proportional to
  • Resistance
  • Time
  • Current
  • Chemical equivalent of the ion.
An electrolyte is one
  • Which conducts electric current in any solvent
  • Which is capable of ionisation by passing electric current
  • which dissociates into ions by dissolving in a suitable solvent
  • none of the above
When a lead storage battery is discharged
  • SO2 is evolved
  • lead sulphate is consumed
  • lead is formed
  • sulphuric acid is consumed
When a copper wire is placed in a solution of AgNO3, the solution acquires blue colour. This is due to the formation of
  • Cu2+ ions
  • Cu+ ions
  • Soluble complex of copper with AgNO3
  • Cu‒ ion by the reduction Cu.
One faraday is equal to
  • 69500 coulombs
  • 99500 coulombs
  • 96500 coulombs approximately
  • None of the above
For measuring the conductivity of an electrolyte, its solution should be prepared in
  • tap water
  • Distilled water
  • Conductivity water
  • Polywater
K, Ca and Li metals may be arranged in the decreasing order of their standard electrode potential as
  • K, Ca, Li
  • Li, K, Ca
  • Li, Ca, K
  • Ca, K, Li
In the electrolysis of NaCI:
  • Cl− is oxidized at anode
  • Cl− is reduced at anode
  • Cl− is oxidized at cathode
  • Cl− is neither reduced nor oxidised
The correct order of chemical reactivity with water according to electrochemical series is
  • K > Mg > Zn > Cu
  • Mg > Zn > Cu > K
  • K > Zn > Mg > Cu
  • Cu > Zn > Mg > k
The number of faradays required to deposit 1 g equivalent of aluminium (At. Wt. =from a solution of aluminium chloride will be
  • 1
  • 2
  • 3
  • 4
On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
  • hydrogen
  • oxygen
  • hydrogen sulphide
  • Sulphur dioxide
When CuSO4 is electrolysed by platinum electrodes,
  • copper is liberated at cathode, Sulphur at anode
  • copper is liberated at cathode, oxygen at anode
  • sulphur is liberated at cathode, oxygen at anode
  • oxygen is liberated at cathode, copper at anode
The amount of electricity that can deposit 108 g of silver from silver nitrate solution is
  • 1 Ampere
  • 1 Coulomb
  • 1 Faraday
  • 2 Ampere
Four alkali metals A, B, C and D are having respectively standard electrode potentials as ‒ 3.05, ‒ 1.66, ‒ 0.40 and 0.80 V. Which one will be the most reducing.
  • A
  • B
  • C
  • D
The most durable metal plating on iron to protect against corrosion is
  • nickel plating
  • copper plating
  • tin plating
  • zinc plating
Which one of the following cells can convert chemical energy of H2 and O2 directly into electrical energy?
  • Mercury cell
  • Daniell cell
  • Fuel cell
  • Lead storage cell
Which reaction is not feasible?
  • 2KI + Br2 → 2KBr + I2
  • 2KBr + I2 →2KI + Br2
  • 2KBr + Cl2 → 2KCl + Br2
  • 2H2O + 2F2 → 4HF + O2
The relationship between stardard reduction potential of a cell and equilibrium constant is shown by

  • Chemistry-Electrochemistry-3332.png
  • 2)
    Chemistry-Electrochemistry-3333.png

  • Chemistry-Electrochemistry-3334.png

  • Chemistry-Electrochemistry-3335.png
What will be the emf for the given cell Pt|H2(P1)| H+ (aq) |H2(P2)| Pt

  • Chemistry-Electrochemistry-3337.png
  • 2)
    Chemistry-Electrochemistry-3338.png

  • Chemistry-Electrochemistry-3339.png
  • none of these
Which of the following reaction is possible at anode ?

  • Chemistry-Electrochemistry-3341.png
  • 2)
    Chemistry-Electrochemistry-3342.png

  • Chemistry-Electrochemistry-3343.png
  • none of these
The resistance of 1 N solution of acetic acid is 250 ohm, when measured in a cell of cell constant 1.15 cm-1. The equivalent conductance (in ohm-1 cm2 equiv-1) of 1 N acetic acid is
  • 4.6
  • 9.2
  • 18.4
  • 0.023
If 0.01M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm-1 then its molar conductance in ohm-1 cm2 mol-1 will be
  • 104
  • 103
  • 102
  • 10
The specific conductivity of N/10 KCl solution at 20oC is 0.0212 ohm-1 cm-1 and the resistance of the cell containing this solution at 20oC is 55 ohm.The cell constant is
  • 4.616 cm-1
  • 1.166 cm-1
  • 2.173 cm-1
  • 3.324 cm-1
0:0:1


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