Chemistry - Redox Reactions Question with Solution | TestHub
ChemistryRedox ReactionsDouble IndicatorMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
A volume of 50 ml of solution containing 1 g each of Na₂CO₃, NaHCO₃ and NaOH was treated with N-HCl.
What will be the titre reading if methyl orange is added after the first end point with phenolphthalein?
Options:
Answer:
B
Solution:
After the phenolphthalein end point the solution contains HCO₃⁻ from Na₂CO₃ (9.43 mmol) plus the original NaHCO₃ (11.9 mmol). Methyl orange then neutralizes these to H₂CO₃: 9.43 + 11.9 = 21.34 mmol HCl. Titre = 21.3 ml, matching (b).
Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Double Indicator
⏱ 2mℹ️ Source: QB
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