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Catalytic Hydrogenation

Assertion :Th...

Question

Assertion :The thiosulfate anion reacts stoichiometrically with iodine in aqueous solution, reducing it to iodide as it is oxidized to tetrathionate. Reason: Sodium thiosulphate is used as a titrant in iodometry

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sodium thiosulphate is a reducing agent and reacts with iodine molecules to convert them to iodine.
$I_{2} + 2 S_{2} O_{3}^{2 -} ⟶ S_{4} O_{6}^{2 -} + 2 I^{-}$
Sodium thiosulphate can act both as oxidising and reducing agent and it is used as reducing agent in iodometry to determine amount of iodine.

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