Perform transformations HI-I2-KI-HgI2-K2 (HgI4)

1. Decomposition of hydrogen iodide when heated to 200 ° C.
2HI = H2 + I2.
2. Dissolving iodine in a concentrated alkali solution.
I2 + 2KOH = KI + KIO + H2O.
3. The reaction of exchange of mercury chloride with potassium iodide.
2KI + HgCl2 = HgI2 + 2KCl.
4. Mercury iodide with alkali metal yardide forms tetraiodomercurate.
HgI2 + 2KI = K2 [HgI4].

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