Q25 / 225 · JEE Main 2003 · Chemistry

Which one of the following statements is correct?

  • Correct answer
    A
    From a mixed precipitate of $\mathrm{AgCl}$ and $\mathrm{AgI}$, ammonia solution dissolves only $\mathrm{AgCl}$
  • B
    Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
  • C
    On boiling a solution having $\mathrm{K}^{+}, \mathrm{Ca}^{2+}$ and $\mathrm{HCO}_3^{-}$ions we get a precipitate of $\mathrm{K}_2 \mathrm{Ca}\left(\mathrm{CO}_3\right)_2$.
  • D
    Manganese salts give a violet borax bead test in the reducing flame

Solution

Ammonia can dissolve ppt. of Agcl only due to formation of complex as given below: $\mathrm{AgCl}+2 \mathrm{NH}_3 \rightarrow\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{Cl}$

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

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