WAEC Chemistry 2020 Paper

Concept:Standard conditions are fixed reference values used to measure energy changes in thermochemical reactions.Explanation:Standard temperature is $298\ \mathrm{K}$.Standard pressure is $1\ \mathrm{atm}$.For solutions, the standard concentration is $1\ \mathrm{mol/dm^3}$.The enthalpy change, $\Delta H$, at $298\ \mathrm{K}$ is called the standard enthalpy change, not the activation energy.Activation energy is a different quantity, so statement D is incorrect.Answer:Option D