NEET UG CHEMISTRY MCQ: S-BLOCK ELEMENTS

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The outermost electron is most loosely held in:

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Correct option: D

\mathrm{Cs}

Option D (Cs) is correct because Cesium has the lowest ionization energy among the alkali metals, meaning its outermost electron is most loosely held.

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\underset {\text{(dilute)}}{Ba(OH)_2}+H_2O_2+ClO_2 \longrightarrow