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An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions. 

(i) It gives a white turbidity with dilute hydrochloric acid solution. 

(ii) It decolourises a solution of iodine in potassium iodide. 

(iii) It gives white ppt. with silver nitrate solution which turns black on standing.

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X containing S2 O2−3 as it decolourises I which also coincides with the other 2 statement I and (II) 

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