In an electro-osmosis experiment the particles of a sol are held fixed by a porous diaphragm and the dispersion medium is observed to move towards the anode. The sol is therefore ... and, if its particles were free, they would move in electrophoresis towards the ...

Apositively charged; anode
Bnegatively charged; cathode
Cpositively charged; cathode
Dnegatively charged; anode

Answer: C

The medium carries the charge opposite to that of the dispersed particles. Medium moving to the anode is negatively charged, hence the particles are positively charged. Free positive particles move to the cathode in electrophoresis.

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