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Questions and Answers
What forms when hot centrifugate is cooled?
What forms when hot centrifugate is cooled?
- PbI₂
- PbSO₄
- PbCl₂ (correct)
- PbCrO₄
What precipitate forms when a hot solution of Pb²⁺ is combined with K₂CrO₄ solution and dil. acetic acid?
What precipitate forms when a hot solution of Pb²⁺ is combined with K₂CrO₄ solution and dil. acetic acid?
- Orange ppt. of PbCl₂
- Yellow ppt. of PbCrO₄ (correct)
- White ppt. of PbI₂
- Yellow ppt. of PbSO₄
Why is PbCrO₄ precipitate soluble in dilute mineral acids?
Why is PbCrO₄ precipitate soluble in dilute mineral acids?
- PbI₂ forms from PbCrO₄ and is soluble in hot water
- CrO₄⁻² converts to Cr₂O₇⁻² forming soluble lead dichromate (correct)
- PbSO₄ forms from PbCrO₄ and dissolves in acids
- PbCrO₄ reacts with mineral acids to form soluble PbCl₂
What is observed when a hot solution of Pb²⁺ reacts with KI solution?
What is observed when a hot solution of Pb²⁺ reacts with KI solution?
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Which solution can dissolve PbSO₄ precipitate?
Which solution can dissolve PbSO₄ precipitate?
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