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In an electrophoresis experiment the distance travelled by the particles of a negative sol in a fixed time is proportional to the applied voltage divided by the electrode separation. Select the correct statements.

  1. ADoubling the voltage at fixed separation doubles the distance moved in a given time
  2. BDoubling the electrode separation at fixed voltage doubles the distance moved in a given time
  3. CThe particles of the negative sol move towards the anode
  4. DIn electro-osmosis with the particles held fixed, the medium of this sol moves towards the anode

Answer: A, C

Distance is proportional to , so doubling doubles it, but doubling halves it. A negative sol moves towards the anode. In electro-osmosis the medium of a negative sol carries the opposite (positive) charge and moves towards the cathode, not the anode.
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