Which of the following is/are soluble in ethanol?

H g F_{2}

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H g C l_{2}

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H g B r_{2}

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H g I_{2}

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All of these

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Solution

The correct option is A $H g F_{2}$
Option (A) is correct.
$H g F_{2}$ is soluble in ethanol because $H g F_{2}$ is an ionic compound and is soluble in ethanol. It is also hydrolysed by cold water to form hydrofluoric acid.
The other halides of mercury are much more covalent in nature and have low melting and boiling points in comparison to the fluoride. They are also reasonably soluble in a variety of organic solvents, and in water and they form complexes.

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