Chemistry - Redox Reactions Question with Solution | TestHub
ChemistryRedox ReactionsDouble IndicatorEasy2 minQB
ChemistryEasysingle choice
One gram of a sample of was strongly heated and the liberated absorbed in 100 ml of 0.4 M . Assuming 80% purity for the sample, how many ml of 0.5 M would be required to react with the solution of the alkali for the phenolphthalein end point?
Options:
Answer:
A
Solution:
= 0.8 g = 8 mmol, so = 8 mmol, consuming 16 mmol of the 40 mmol and forming 8 mmol ; left = 24 mmol. Phenolphthalein end point: = 24 + 8 = 32 mmol. Volume of 0.5 M = 32/0.5 = 64 ml, option (a).
Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Double Indicator
⏱ 2mℹ️ Source: QB
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