Which of the following ions has a higher hydr | vedclass

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Question

(A) Hydration enthalpy is directly proportional to the charge density of the ion. Charge density is defined as $\frac{	ext{charge}}{	ext{size}}$. Fo

Vedclass · Accepted Answer

$Al^{3+}$

Vedclass · Answer

(A) Hydration enthalpy is directly proportional to the charge density of the ion. Charge density is defined as $\frac{	ext{charge}}{	ext{size}}$. For $Mg^{2+}$,the charge is $+2$. Comparing the options: $Al^{3+}$ has a higher charge $(+3)$ and a smaller ionic radius than $Mg^{2+}$,resulting in a higher charge density. $Be^{2+}$ also has a higher charge density due to its smaller size. $Na^+$ has a lower charge $(+1)$ and a larger size,so its hydration enthalpy is lower. $Mg^{3+}$ is not a stable ion in aqueous solution. Therefore,both $Al^{3+}$ and $Be^{2+}$ have higher hydration enthalpies than $Mg^{2+}$. Given the standard options,$Al^{3+}$ is the most appropriate answer.

Metal	Uses
$1. \text{Be}$	$c. \text{To prepare windows of X-rays}$
$2. \text{Ca}$	$d. \text{To remove air from vacuumized tubes}$
$3. \text{Mg}$	$a. \text{To prepare Grignard reagent}$

Which of the following ions has a higher hydration enthalpy than the $Mg^{2+}$ ion?

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Match the following:

Metal Uses

$1. \text{Be}$ $c. \text{To prepare windows of X-rays}$

$2. \text{Ca}$ $d. \text{To remove air from vacuumized tubes}$

$3. \text{Mg}$ $a. \text{To prepare Grignard reagent}$

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