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Chemistry - Redox Reactions Question with Solution | TestHub

ChemistryRedox ReactionsTitrationHard2 minQB

ChemistryHardsingle choice

A solution of $N a_{2} S_{2} O_{3}$ is standardized iodometrically against 0.0835 g of $KBr O_{3}$ . This process required 30 ml of the $N a_{2} S_{2} O_{3}$ solution. What is the strength of the $N a_{2} S_{2} O_{3}$ ? (K = 39, Br = 80)

Options:

Answer:

Solution:

mol $KBr O_{3}$ = 0.0835/167 = 0.5 mmol; Br(+5) $\to$ Br(-1) liberates 3 $I_{2}$ per $Br O_{3}^{-}$ , so $I_{2}$ = 1.5 mmol and $S_{2} O_{3}^{2 -}$ = 3 mmol in 30 ml $\to$ 0.1 M, option (c).

Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Titration

⏱ 2mℹ️ Source: QB

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