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Q 2687356287.     A light bluish green crystalline compound responds to the following tests
(i) Its aqueous solution gives a brown precipitate or colouration with `K_2[HgI_4 ]`.
(ii) Its aqueous solution gives a blue colour with `K_3 [ Fe (CN)_6 ]`.
(iii) Its solution in hydrochloric acid gives a white precipitate with `BaCl_ 2`.
Identify the ions present and suggest the formula of the compound.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)