(D) In alkaline medium, $SnO_2$ reacts with $OH^-$ ions to form stannate ions, making the sol $[SnO_2] SnO_3^{2-}$, which is negatively charged.In aci

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(D) In alkaline medium, $SnO_2$ reacts with $OH^-$ ions to form stannate ions, making the sol $[SnO_2] SnO_3^{2-}$, which is negatively charged.In acidic medium, $SnO_2$ reacts with $H^+$ ions to form $Sn^{4+}$ ions on the surface, making the sol $[SnO_2] Sn^{4+}$, which is positively charged.Therefore, the charges are negative and positive respectively.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

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The charge of $SnO_2$-sol in alkaline and acidic medium are respectively (Hint: $SnO_2$ is amphoteric oxide).

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A
positive and positive
B
negative and negative
C
positive and negative
D
negative and positive

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The charge of $SnO_2$-sol in alkaline and acidic medium are respectively (Hint: $SnO_2$ is amphoteric oxide).

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