[AFMC 1995]
A) $ Li $
B) $ K $
C) $ Na $
D) $ Rb $
Correct Answer: D
$ 2Rb+2H_2O\to 2RbOH+H_2 $
$ \xrightarrow{Li<Na<K<Rb<Cs} $ As we go down the group reactivity with $ H_2O $ increases.
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