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white powder P when strongly heated gives a yellow residue,the color remain yellow on cooling .the gas evolved turns lime water turbid has no effect on acidified potassium permanganate ,identify P
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The gas evolved is surely carbon dioxide.
Now, in my knowledge, only two common compounds (residues) have yellow color and that are ZnO and PbO.
But, the question says that the residue remains yellow after cooling. So, we can conclude that the compound must be PbO as PbO when hot is yellowish-orange and when cooled, it is yellow. ZnO when hot is yellow but when cooled, it is white.
Now, which lead compound should we heat to get PbO and CO2 gas???
The compound must be white colored PbCO3 (lead carbonate).if
When, PBCO3( white) is heated then PbO (yellow residue) is formed and CO2 gas (turns lime water milky has no effect on acidified potassium permanganate).
PbCO3+ Heat ==> PbO⬇️+ CO2⬆️
At last, we can conclude that P is LEAD(II) CARBONATE (PbCO3).
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Now, in my knowledge, only two common compounds (residues) have yellow color and that are ZnO and PbO.
But, the question says that the residue remains yellow after cooling. So, we can conclude that the compound must be PbO as PbO when hot is yellowish-orange and when cooled, it is yellow. ZnO when hot is yellow but when cooled, it is white.
Now, which lead compound should we heat to get PbO and CO2 gas???
The compound must be white colored PbCO3 (lead carbonate).if
When, PBCO3( white) is heated then PbO (yellow residue) is formed and CO2 gas (turns lime water milky has no effect on acidified potassium permanganate).
PbCO3+ Heat ==> PbO⬇️+ CO2⬆️
At last, we can conclude that P is LEAD(II) CARBONATE (PbCO3).
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Answer in PbCO3
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