Which of the following reducing agents is/are stable towards oxidation by air and their solution can be kept for a long period of time?

Sodium thiosulphate

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Iron (II) ion

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Iodide ion

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Chromium (II) ion

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Solution

The correct option is B Sodium thiosulphate
Air oxidation takes place rapidly in neutral solutions but is inhibited in the presence of acids.

Thiosulfate ion ( $S_{2} O_{3}^{2 -}$ ) is a moderately strong reducing agent that has been widely used to determine oxidizing agents by an indirect procedure, it is one of the few reducing agents that is stable towards air oxidation.

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