Which of the following iron salts exists as a dimer?

Ferric chloride

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Ferrous chloride

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Ferrous sulphate

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Mohrs salt

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Solution

The correct option is A Ferric chloride
Iron(III) chloride has a relatively low melting point and boils at around $315^{o} C$ . Its vapour consists of the dimer $F e_{2} C l_{6}$ which increasingly dissociates into the monomeric $F e C l_{3}$ .

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