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Question:

HgCl2 and I2, both when dissolved in water containing I− ions, the pair of species formed is:

HgI2,I⁻

Hg2I2,I⁻

HgI2⁻,I⁻

HgI2,I⁻

Solution:

HgCl2 and I2, both when dissolved in water containing I⁻ ions, the pair of species formed is HgI2⁻,I⁻.