Alkali metals react with water vigorously to form hydroxides and dihydrogen . Which of the following alkali metal reacts with water least vigorously ?

Alkali metals react with water vigorously to form hydroxides and dihyd

1.	Alkali metals react with water vigorously to form hydroxides and dihydrogen . Which of the following alkali metal reacts with water least vigorously ?
Answer» <html><body><p>Li <br/>Na <br/>K <br/>Cs</p>Solution :Both m.p. and heat of the reaction of alkali metals with `H_(2)O` decreases down the group from Li to Cs . <br/> Although the heat of reaction of Li is thehighest but <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to its high melting <a href="https://interviewquestions.tuteehub.com/tag/point-1157106" style="font-weight:bold;" target="_blank" title="Click to know more about POINT">POINT</a> , <a href="https://interviewquestions.tuteehub.com/tag/even-976335" style="font-weight:bold;" target="_blank" title="Click to know more about EVEN">EVEN</a> the heat is not sufficient to melt the <a href="https://interviewquestions.tuteehub.com/tag/metal-1094457" style="font-weight:bold;" target="_blank" title="Click to know more about METAL">METAL</a> thereby exposing greater surface to water for reaction . as a result , Li has the least reactivity by the reactivity increases as the m.p. of the alkali metals decrease down the group from Li to Cs .</body></html>