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(i) A salt solution gives a yellow ppt. ...

(i) A salt solution gives a yellow ppt. with `BaCl_2` which is soluble in dil. HCL. On adding acid to the salt solution, it becomes orange in colour. Identify the acid radical.
(ii) On treating the salt with dil HCI, a colourless gas turning brown on exposure to air was evolved. On adding `FeSO_4`, solution, the salt solution gives a brown colour Identify the acid radical present in the salt

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To solve the given question, we will break it down into two parts as per the requirements. ### Part (i) 1. **Observation of Yellow Precipitate**: The salt solution gives a yellow precipitate with `BaCl2`. The yellow precipitate indicates the presence of chromate ions (CrO4^2-), which form barium chromate (BaCrO4) when reacted with barium chloride. **Hint**: Remember that certain metal ions form characteristic colored precipitates with specific reagents. 2. **Solubility in Dilute HCl**: The yellow precipitate is soluble in dilute HCl. This is consistent with the behavior of barium chromate, which dissolves in acid to form dichromate ions (Cr2O7^2-), which are orange in color. ...
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