NEET Chemistry - New - Electrochemistry

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Question - 1

The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 X 10-3 S cm-1 at 298 K is :

  • A 2.88 S cm2/mol
  • B 11.52 S cm2/mol
  • C 0.086 S cm2/mol
  • D 28.8 S cm2/mol

Question - 2

At 250C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 Ω -1 cm2 mol-1 and at infinite dilution, its molar conductance is 238 Ω-1 cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :

  • A 2.080 %
  • B 20.800 %
  • C 4.008 %
  • D 40.800 %

Question - 3

Limiting molar conductivity of NH4OH (i.e., Åm (NH4OH) is equal to :

  • A Å m(\({ NH }_{ 4 }\)Cl) + Å m(NaCl) - Å m(NaOH)
  • B Å m(NaOH) + Å m(NaCl) - Å m(\({ NH }_{ 4 }\)Cl)
  • C Å m(\({ NH }_{ 4 }\)OH) + Å m(\({ NH }_{ 4 }\)Cl) - Å m(HCl)
  • D Å m(\({ NH }_{ 4 }\)Cl) + Å m(NaOH) - Å m(NaCl)

Question - 4

The equivalent conductance of Ba2+ and Cl- are 127 and 76 Ω-l cm-1 eq-1 respectively at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be:

  • A 139.52
  • B 203
  • C 279
  • D 101.5

Question - 5

Equivalent conductance of NaCI, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 Ω-l cm2, respectively. The equivalent conductance of C2H5COOH is :

  • A 201.28 Ω-l cm2
  • B 390.71 Ω-l cm2
  • C 698.28 Ω-l cm2
  • D 540.48 Ω-l cm2

Question - 6

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine  gas using a current of 3 amperes is :

  • A 55 minutes
  • B 110 minutes
  • C 220 minutes
  • D 330 minutes

Question - 7

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 second is: (charge on electron = 1.60 x 10-19 C)

  • A 6 x 1023
  • B 6 x 1020
  • C 3.75 x 1020
  • D 7.48 x 1023

Question - 8

When 0.1 mole of MnO42- is oxidized, the quantity of electricity required to completely oxidize MnO42- to MnO4- is :

  • A 96500 C
  • B 2 x 96500 C
  • C 9650 C
  • D 96.50 C

Question - 9

The weight of silver (atomic weight = 108), displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be :

  • A 5.4 g
  • B 10.8 g
  • C 54.0 g
  • D 108.0 g

Question - 10

Al2O3 is reduced by electrolysis at low potential and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? [Assume 100% current efficiency, atomic mass of Al = 27 g mol-1]

  • A 9.0 x 103 g
  • B 8.1 x 104 g
  • C 2.4 x 105 g
  • D 1.3 x 104 g
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