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(B) $1$. An apple green flame test is a characteristic feature of $Ba^{2+}$ ions.$2$. $Ba^{2+}$ ions react with $K_{2}CrO_{4}$ in an acetic acid mediu

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$Ba^{2+}$ and $PO_{4}^{3-}$

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(B) $1$. An apple green flame test is a characteristic feature of $Ba^{2+}$ ions.$2$. $Ba^{2+}$ ions react with $K_{2}CrO_{4}$ in an acetic acid medium to form a yellow precipitate of barium chromate $(BaCrO_{4})$.$3$. The formation of a canary yellow precipitate upon heating the sodium carbonate extract with conc. $HNO_{3}$ and ammonium molybdate is a confirmatory test for the presence of phosphate ions $(PO_{4}^{3-})$.$4$. Therefore,the salt contains $Ba^{2+}$ as the cation and $PO_{4}^{3-}$ as the anion.

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