Quizzes
Data: for oxygen, the first electron gain enthalpy is -141 kJ mol⁻¹ and the second is +780 kJ mol⁻¹. Consider four statements. S1: ΔegH of Cl is more negative than that of F, because an electron added to the compact 2p subshell of F meets strong repulsion. S2: Be and N have positive or near-zero ΔegH for the same reason: the added electron enters a new, higher-energy subshell. S3: for O(g) + 2e⁻ → O²⁻(g), Δ H = +639 kJ mol⁻¹. S4: because of S1, Cl₂ is a stronger oxidising agent than F₂ in water. Which statements are correct?

Data: for oxygen, the first electron gain enthalpy is $-141\ \text{kJ mol}^{-1}$ and the second is $+780\ \text{kJ mol}^{-1}$ . Consider four statements. S1: $\Delta_{eg}H$ of Cl is more negative than that of F, because an electron added to the compact 2p subshell of F meets strong repulsion. S2: Be and N have positive or near-zero $\Delta_{eg}H$ for the same reason: the added electron enters a new, higher-energy subshell. S3: for $\text{O(g)} + 2e^- \rightarrow \text{O}^{2-}\text{(g)}$ , $\Delta H = +639\ \text{kJ mol}^{-1}$ . S4: because of S1, $\text{Cl}_2$ is a stronger oxidising agent than $\text{F}_2$ in water. Which statements are correct?

Discussion (0)

Loading…