s-Block ElementsHard
Question
Which of the following has the highest reactivity towards water ?
Options
A.Na
B.Rb
C.Li
D.K
Solution
The reaction of alkali metals with water becomes increasingly violent on descending the group on account of their decreasing ionisation energies with increasing atomic size. So, the order of reactivity is :
Li < Na < K < Rb.
Li < Na < K < Rb.
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