Which of the following alkali metal hydroxides is the strongest base ?

LiOH

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KOH

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NaOH

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RbOH

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Solution

The correct option is A LiOH
$L i O H ⟶ L i^{+} + O H^{-}$
$K O H ⟶ K^{+} + O H^{-}$
$N a O H ⟶ N a^{+} + O H^{-}$
$R b O H ⟶ R b^{+} + O H^{-}$
The strongest base is the one in which the metal ion formed by donating $O H^{-}$ ion is most stable.
The stability order of the ions is:
$L i^{+} > N a^{+} > K^{+} > R b^{+}$
Therefore, $L i O H$ is the strongest base.

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Which of the following alkali metal hydroxides is the strongest base ?

The correct option is A LiOHLiOH⟶Li++OH−KOH⟶K++OH−NaOH⟶Na++OH−RbOH⟶Rb++OH−The strongest base is the one in which the metal ion formed by donating OH− ion is most stable.The stability order of the ions is:Li+>Na+>K+>Rb+Therefore, LiOH is the strongest base.