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.
I2+2S2O2−3⟶S4O2−6+2I−
Sodium thiosulphate can act both as oxidising and reducing agent and it is used as reducing agent in iodometry to determine amount of iodine.