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Which of the following is true regarding the reactivity order of alkali metals towards hydrogen?(a) Li < Na < K > Rb(b) Lithium < Na < K < Rb < Cs(c) Li > Na < Cs(d) Li < Rb > CsI got this question during an online interview.My doubt stems from s-Block Elements in section s-Block Elements of Chemistry – Class 11

Answer»

The correct OPTION is (b) Lithium < Na < K < Rb < Cs

To explain I would say: 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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