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Which of the following is true regarding the reactivity order of alkali metals towards hydrogen?

Which of the following is true regarding the reactivity order of alkali metals towards hydrogen? Correct Answer Lithium < Na < K < Rb < Cs

Two moles of alkali metal reacts with one mole of hydrogen molecule in order to form 2 moles of alkali metal hydride. The correct order of reactivity of alkali metals towards hydrogen is Li < Na < K < Rb < Cs.

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