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Which transition involves maximum amount of energy?

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Which transition involves maximum amount of energy?

(a) M-(g) → M(g) + e-

(b) M-(g) → M+(g) + 2e-

(c) M+(g) → M2+(g) + e-

(d) M2+(g) → M3+(g) + e-

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Correct answer: (d) M2+(g) → M3+(g) + e-

Explanation:

The energy involved is ionisation energy (I.E.). Further the 3rd ionisation energy will be greater than the 2nd and 1st.

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