$t_{1 / 2}=\frac{12}{5} min =2.4$
$\approx 2$
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$A.$ The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy.
$B.$ $E _{\text {cell }}^0$ is dependent on the pressure
$C.$ $\frac{ dE ^0 \text { cell }}{ dT }=\frac{\Delta_{ r } S ^0}{ nF }$
$D.$ A cell is operating reversibly if the cell potential is exactly balanced by an opposing source of potential difference.
Statement $I$ : The boiling point of three isomeric pentanes follows the order
n-pentane $>$ isopentane $>$ neopentane
Statement $II$ : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below: