Q28 / 160 · AP EAMCET 2022 (08 Jul Shift 2) · Chemistry

When a dilute $\mathrm{AgNO}_3$ solution is mixed with excess of dilute $\mathrm{KI}$, the colloidal solution formed is

  • A
    $\mathrm{AgNO}_3 / \mathrm{I}^{-}$
  • B
    Agl
  • C
    $\mathrm{Agl} / \mathrm{Ag}^{+}$
  • Correct answer
    D
    $\mathrm{Agl} / \mathrm{I}^{-}$

Solution

When dilute aqueous solution of $\mathrm{AgNO}_3$ is added to dilute solution of $\mathrm{KI}$ (excess) a negatively charged sol of AgI is formed due to the preferential adsorption of $\mathrm{I}^{-}$ions from the dispersion medium.

Hence, the correct answer is option: 'D'.

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