Question

Which of the following alkali metal hydroxides is the
strongest base ?
(a) LiOH
(b) KOH
(cÌNaOH
(d) RbOH​

Answer 1

Answer:

The hydroxide of Sodium Or NaOH is the strongest base.

So, option (b) is correct.

Answer 2

Actually strength of any alkalinedepends on the concentration of HYDROXIDE IONS

(water soluble base, in aqueous medium)

(I am not talking about any other base, because there are several base which do not dissociate into ions in aqueous medium but still are base)

Since in above alkali metal hydroxides, anion is same that is the hydroxide ion, so you have to look at the cation,

In aqueous medium, more ionic compounds dissociate into ions easily than less ionic,

Covalent compounds do not dissociate into ions,

So according to the Fajan's rule,

Larger the size of the cation, more ionic will be the compound

So since cesium is largest cation, most ionic compound is Cs(OH)

and it dissociate most easily, so it is most basic

In your question basicity increases downwards!

Answer to your questions is Rb(OH)