We have to determine what would be the expected reactivity of rubidium metal with water.
Alkali metals react vigorously with water to produce their hydroxides and hydrogen gas.
2 M(s) + 2 H2O(l) → 2 MOH(aq) + H2(g)
M represents any alkali metal from Li to Cs.
Would you expect rubidium metal to be more or less reactive with water than potassium metal?
The alkali metals react vigorously with water.
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