sno2 forms a positive charge colloidal solution in acidic medium and negatively charged in basic medium
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thats true bro so whats the question actually........?
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Explanation: SnO2 is amphoteric in nature. It reacts with acid, eg. HCL to form SnCl4 in the solution. The common Sn4 + ions are adsorbed on the surface of SnO2 particles giving the positive charge.
SnO2 reacts with a base, eg., NaOH to form sodium stannate in the solution. The Stannate ions are adsorbed on the surface of SnO2 particles giving them the negative charge.
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