Question

Which of the following situations demonstrate(s) an increase in entropy?
i. Dissolving a salt into water
ii. Sublimation
iii. Heating up a liquid.

• A. i only
• B. i and ii only
• C. ii and iii Only
• D. i and iii Only
• E. i. ii. and iii

Answer 1

The correct option is E i. ii. and iii

$NaCl\left(aq\right)\to N{a}^{+}+C{l}^{-}$
Here, the $NaCl$ is dissociated into ions, so these ions in aqueous solution free to move, hence, these are disordered in aqueous solution more than that of in solid state.
$C{O}_2\left(Solid\right)\to C{O}_2\left(gas\right)$ , coversion of solid into gas is increase in entropy.
$H_{2}O\left(liquid\right)\to H_{2}O\left(vapour\right)$ this is also a case of increase in entropy.