JEE Mains · Chemistry · STD 11 - 8.3. Organic chemistry purification and characterization
A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with \(K_2CrO_4\) to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. \(HNO_3\) and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,
- A \(Ca^{2+}\) and \(SO_4^{2-}\)
- B \(Ba^{2+}\) and \(PO_4^{3-}\)
- C \(Mn^{2+}\) and \(PO_4^{3-}\)
- D \(Ba^{2+}\) and \(SO_4^{2-}\)
Answer & Solution
Correct Answer
(B) \(Ba^{2+}\) and \(PO_4^{3-}\)
Step-by-step Solution
Detailed explanation
An apple green colour in the flame test indicates the presence of \(Ba^{2+}\) ion. The group precipitate of \(Ba^{2+}\) is \(BaCO_3\), which dissolves in acetic acid to form barium acetate. Upon treatment with \(K_2CrO_4\), it gives a yellow precipitate of barium chromate…
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