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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY
1
Hard
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Analyzing
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The molar mass of an unknown organic liquid is determined by placing of the liquid in a weighed conical flask fitted with a piece of foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and fill the flask with the unknown vapor at atmospheric pressure. After cooling to room temperature the flask and its contents are reweighed. The uncertainty in which piece of apparatus causes the largest percentage error in the molar mass?
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Correct option: A
Balance
Option A is correct because the balance has the smallest absolute uncertainty but contributes the largest percentage error due to its impact on the molar mass calculation.
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