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Question: Answered & Verified by Expert
The increasing order of reactivity of alkaline earth metals with water is
Chemistrys Block ElementsMHT CETMHT CET 2020 (15 Oct Shift 2)
Options:
  • A $\mathrm{Mg} < \mathrm{Sr} < \mathrm{Ca} < \mathrm{Ba}$
  • B $\mathrm{Ba} < \mathrm{Mg} < \mathrm{Ca} < \mathrm{Sr}$
  • C $\mathrm{Ba} < \mathrm{Sr} < \mathrm{Ca} < \mathrm{Mg}$
  • D $\mathrm{Mg} < \mathrm{Ca} < \mathrm{Sr} < \mathrm{Ba}$
Solution:
2227 Upvotes Verified Answer
The correct answer is: $\mathrm{Mg} < \mathrm{Ca} < \mathrm{Sr} < \mathrm{Ba}$
From top to bottom of the group, size of atoms increases hence the valence electrons goes away from the nucleus. Therefore, the reactivity of alkaline earth metals increases from top to bottom of the group.

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