WAEC Physics questions: Conduction of electricity through liquids and gases

9 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Conduction of electricity through liquids and gases· WAEC

   The mass of a substance liberated in electrolysis by one coulomb of charge is its

   • Avalency
   • Bmolar mass
   • Crelative atomic mass
   • Delectrochemical equivalent

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2. Question 2· Conduction of electricity through liquids and gases· WAEC

   Pure water is a poor conductor of electricity because it contains

   • Ano hydrogen
   • Bno molecules
   • Ctoo many electrons
   • Dvery few ions

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3. Question 3· Conduction of electricity through liquids and gases· WAEC

   A fluorescent tube produces light by

   • Aheating a filament
   • Ban electric discharge through a gas at low pressure
   • Cburning a gas
   • Dchemical reaction in a cell

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4. Question 4· Conduction of electricity through liquids and gases· WAEC

   During the electrolysis of copper(II) sulphate solution with copper electrodes, the mass of the cathode

   • Aincreases
   • Bdecreases
   • Cstays the same
   • Dbecomes zero

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5. Question 5· Conduction of electricity through liquids and gases· WAEC

   A current of 3 A flows for 10 minutes through an electrolyte. The electrochemical equivalent of the metal is 3 × 10⁻⁷ kg/C. Find the mass deposited.

   • A9 × 10⁻⁷ kg
   • B5.4 × 10⁻⁴ kg
   • C1.8 × 10⁻⁴ kg
   • D5.4 × 10⁻² kg

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6. Question 6· Conduction of electricity through liquids and gases· WAEC

   Electroplating a spoon with silver uses the spoon as the

   • Aelectrolyte
   • Banode
   • Ccathode
   • Dbattery

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7. Question 7· Conduction of electricity through liquids and gases· WAEC

   The mass of a substance liberated in electrolysis is proportional to the

   • Aquantity of charge passed
   • Bvoltage
   • Celectrode size
   • Dtemperature

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8. Question 8· Conduction of electricity through liquids and gases· WAEC

   A current of 2 A passes through copper sulphate solution for 30 minutes. Find the mass of copper deposited. [electrochemical equivalent of copper = 3.3 × 10⁻⁷ kg/C]

   • A3.96 × 10⁻⁵ kg
   • B5.94 × 10⁻⁴ kg
   • C1.98 × 10⁻⁵ kg
   • D1.19 × 10⁻³ kg

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9. Question 9· Conduction of electricity through liquids and gases· WAEC

   In the electrolysis of acidified water, which gas is given off at the cathode?

   • Achlorine
   • Boxygen
   • Chydrogen
   • Dnitrogen

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   Explanation and discussion