In IA group (alkali metals) :

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lithium fluoride is most soluble fluoride (in water)

lithium iodide has maximum covalent character out of all halides

lithium carbonate is thermally least stable carbonate

lithium oxide is most basic oxide

answer is B, C.

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Detailed Solution

Lithium fluoride is least soluble fluoride (in water) in IA group (alkali metals) as solubility increases down the group.

Here, lithium iodide has maximum covalent character out of all halides and lithium carbonate is thermally least stable carbonate.

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