MCQ
Which of the following is not correct?
- A
- B
- C
- D
Explanation:
$\Delta\text{G}$ gives a criterion for spontaneity at constant pressure and temperature.
If $\Delta\text{G}$ is negative (< 0). The process is spontaneous.
If $\Delta\text{G}$ is positive (> 0). The process is non-spontaneous.
If$\Delta\text{G}$ is zero then reaction is at equilibrium.
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$(A)$ $O _2$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2 p }^*$ of $O _2$ is increased
$(D)$ bond length of $O _2$ is increased
($A$) $\mathrm{C}_2^{2-}$ is expected to be diamagnetic
($B$) $\mathrm{O}_2{ }^{2+}$ is expected to have a longer bond length than $\mathrm{O}_2$
($C$) $\mathrm{N}_2^{+}$and $\mathrm{N}_2^{-}$have the same bond order
($D$) $\mathrm{He}_2^{+}$has the same energy as two isolated He atoms