• # question_answer Which of the following reacts with water with high rate [AFMC 1995] A) $Li$ B) $K$ C) $Na$ D) $Rb$

$2Rb+2{{H}_{2}}O\,\to \,2RbOH+{{H}_{2}}$ $\xrightarrow{Li<Na<K<Rb<Cs}$ As we go down the group reactivity with ${{H}_{2}}O$ increases.