Q6 / 90 · JEE Main 2024 (06 Apr Shift 2) · Chemistry

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in \(\mathrm{NH}_4 \mathrm{OH}\) solution when sodium carbonate extract was first acidified with dil. \(\mathrm{HNO}_3\) and then \(\mathrm{AgNO}_3\) solution was added. This indicates presence of :

  • Correct answer
    A
    \(\mathrm{Br}^{-}\)
  • B
    \(\mathrm{I}^{-}\)
  • C
    \(\mathrm{Cl}^{-}\)
  • D
    \(\mathrm{CO}_3{ }^{2-}\)

Solution

$\begin{array}{ll} \mathrm{Ag}^{+}+\mathrm{I}^{-} \rightarrow \mathrm{AgI} & \text{Yellow ppt.} \\ \mathrm{Ag}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{AgCl} & \text{White ppt} \\ \mathrm{Ag}^{+}+\mathrm{Br}^{-} \rightarrow \mathrm{AgBr} & \text{Pale yellow ppt} \end{array}$

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

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