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The aqueous solution of an unknown sodiu...

The aqueous solution of an unknown sodium salt gives the following reactions:
(I) It gives white turbidity with dilute HCI solution
(II) It decoloursise a solution of iodine in potassium iodide
(III) It gives a white precipitate with `AgNO_3` solution which changes colours and finally becomes black on standing. The unknown sodium salt is:

Text Solution

Verified by Experts

The correct Answer is:
D
(i) `Na_2S_2O_3 + 2HCl rarr 2NaCl + SO_(2) + H_2O + S`
(ii) `Kl_3 + 2Na_2S_2O_3 rarr KI + 2NaI + Na_2S_4O_6`
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