Which colloid pair is correctly matched?

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Question

(A) The charge on a colloidal particle is determined by the preferential adsorption of ions from the dispersion medium.$1$. For $[Fe(OH)_3]$,the sol i

Vedclass · Accepted Answer

$[Fe(OH)_3] : Fe^{3+}$

Vedclass · Answer

(A) The charge on a colloidal particle is determined by the preferential adsorption of ions from the dispersion medium.$1$. For $[Fe(OH)_3]$,the sol is positively charged due to the adsorption of $Fe^{3+}$ ions. Thus,option $A$ is correct.$2$. For $[As_2S_3]$,the sol is negatively charged due to the adsorption of $S^{2-}$ ions. However,the standard representation is $[As_2S_3] : S^{2-}$,but option $A$ is a more direct representation of the primary charge-determining ion.$3$. For $[AgI]$,if $AgNO_3$ is in excess,$Ag^+$ ions are adsorbed,making it positively charged $([AgI] : Ag^+)$.$4$. For $[AgI]$,if $KI$ is in excess,$I^-$ ions are adsorbed,making it negatively charged $([AgI] : I^-)$.Therefore,option $A$ is the correctly matched pair.

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