Among the following which is/are correct statement about the metal sulphide sols ?
the sol particles are positively charged due to preferential adsorption of metal ions,
the sol particles are negatively charged due to preferential adsorption of sulphide ions,
the cations of added electrolytes are effective in causing the coagulation of the sol,
the sol is due to both the electric charge and hydration of the particles.
A
the sol particles are positively charged due to preferential adsorption of metal ions
B
the sol partcles are negatively charged due to preferntial adsorption of sulphide ions
C
the cations of added electrolytes are effective in causing the coagulation of the sol
D
the sol is due to both the electric charge and hydration of the particles
