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(C) Lithium and magnesium exhibit a diagonal relationship due to their similar ionic sizes and charge density. $I$) Both $Li$ and $Mg$ react slowly wi

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$I$ & $IV$ only

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(C) Lithium and magnesium exhibit a diagonal relationship due to their similar ionic sizes and charge density. $I$) Both $Li$ and $Mg$ react slowly with water compared to other alkali and alkaline earth metals. This is a correct statement. $II$) Bicarbonates of $Li$ and $Mg$ are not known in solid form; they exist only in solution. This is an incorrect statement. $III$) Chlorides of $Li$ $(LiCl)$ and $Mg$ $(MgCl_2)$ are covalent in nature and are soluble in ethanol. This is an incorrect statement. $IV$) Nitrates of both $Li$ and $Mg$ decompose on heating to form their respective oxides,nitrogen dioxide,and oxygen. This is a correct statement. Therefore,statements $I$ and $IV$ are correct.

Which of the following statements are correct regarding lithium $(Li)$ and magnesium $(Mg)$?
$I$) They react slowly with water
$II$) Their bicarbonates are solids
$III$) Their chlorides are not soluble in ethanol
$IV$) Their nitrates decompose easily on heating
The correct option is

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Which of the following statements are correct regarding lithium $(Li)$ and magnesium $(Mg)$?$I$) They react slowly with water$II$) Their bicarbonates are solids$III$) Their chlorides are not soluble in ethanol$IV$) Their nitrates decompose easily on heatingThe correct option is