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A salt on treatment with dil. HCl gives ...

A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The solution gives a yellow ppt. with potassium chromate. The salt is

A

`NiSO_4`

B

`BaS_2O_3`

C

`PbS_2O_3`

D

`CuSO_4`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the information provided step by step. ### Step 1: Identify the gas produced with dilute HCl When a salt is treated with dilute hydrochloric acid (HCl), it can produce a gas. The question states that a pungent smelling gas is released. Common pungent gases that can be produced in reactions with HCl include hydrogen sulfide (H₂S) or sulfur dioxide (SO₂). **Hint:** Look for salts that contain sulfur, as they often produce pungent gases when reacted with acids. ### Step 2: Identify the yellow precipitate The question mentions that a yellow precipitate is formed when the salt is treated with potassium chromate (K₂CrO₄). A common yellow precipitate formed with potassium chromate is barium chromate (BaCrO₄). This suggests that the salt may contain barium ions (Ba²⁺). **Hint:** Consider salts that can react with chromate ions to form a yellow precipitate. ### Step 3: Analyze the flame test The salt is said to give a green flame when tested. Barium salts are known to produce a green flame when burned. This further supports the idea that the salt contains barium. **Hint:** Recall the flame test colors associated with different metal ions. ### Step 4: Combine the information From the above steps, we can summarize: - The salt produces a pungent smelling gas (possibly H₂S or SO₂). - It forms a yellow precipitate with potassium chromate, indicating the presence of barium. - It gives a green flame, confirming the presence of barium. ### Step 5: Identify the salt Considering all the information, the salt that fits all these criteria is barium thiosulfate (BaS₂O₃). When barium thiosulfate reacts with dilute HCl, it produces sulfur dioxide (SO₂), which is a pungent gas, and a yellow precipitate of barium chromate when treated with potassium chromate. **Final Answer:** The salt is BaS₂O₃ (barium thiosulfate).
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