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BITSAT2010Chemistryd and f Block ElementsActual

Which one of the following statements is correct?

Options

  1. AFrom a mixed precipitate of AgCl and AgI , ammonia solution dissolves only AgCl .
  2. BFerric ions give a deep green precipitate on adding potassium ferrocyanide solution.
  3. COn boiling a solution having K ⁺, Ca ²⁺ and HCO ₃⁻ ions we get a precipitate of K ₂ Ca ( CO ₃ )₂
  4. DManganese salts give a violet borax bead test in the reducing flame.

Correct answer

A. From a mixed precipitate of AgCl and AgI , ammonia solution dissolves only AgCl .

Step-by-step solution

Ammonia can dissolve ppt. of AgCl only due to formation of complex as given below: AgCl +2 NH ₃ [ Ag ( NH ₃ )₂ ] Cl

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