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.




A

`Na_2SO_4. 10H_2O`

B

None of these

C

`Na_2S_2O_3 .5H_2O`

D

`Na_2CO_3. 10H_2O`

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