Identify the correct statements from the foll | vedclass

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(C) ) $Li^+$ has the smallest ionic size among alkali metal ions,leading to the highest charge density and thus the highest hydration enthalpy. This s

Vedclass · Accepted Answer

$A$ & $C$

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(C) ) $Li^+$ has the smallest ionic size among alkali metal ions,leading to the highest charge density and thus the highest hydration enthalpy. This statement is correct.$B$) The boiling point of alkali metals decreases from $Li$ to $Cs$ because the metallic bond strength decreases as the atomic size increases. This statement is incorrect.$C$) The density of alkali metals generally increases down the group,but $K$ is an exception because of an unusual increase in atomic volume. Thus,the density of $K$ is less than that of $Na$ and $Rb$. This statement is correct.$D$) $Li$ forms only the oxide $(Li_2O)$ and peroxide $(Li_2O_2)$ due to the small size of the $Li^+$ ion,which cannot stabilize the large superoxide ion $(O_2^-)$. This statement is incorrect.Therefore,statements $A$ and $C$ are correct.

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