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Q 1129180911.     An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions:
(a) It gives a white turbidity with dilute HCl solution
(b) It decolourises a solution of iodine in potassium iodide
(c) It gives a white precipitate with silver nitrate solution which turns black on standing.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)