Question

When active metals are dissolved in water, the result is an increase in enthalpy and entropy. Ionic compounds behave in much the same way as pure metals.
Given equal masses of each dissolved in $100mL$ of water, which of the following will produce the largest release of free energy?

• A. $KCl$
• B. $CaC{l}_2$
• C. $Ca$
• D. $K$

Answer 1

The correct option is D $K$

$\text{Compounds are most stable than element so they consist less enegy in it.}$

$\text{Alkali metals are highly reactive and release high energy when react with water. So K will be the correct answer.}$