A) RbOH
B) LiOH
C) KOH
D) NaOH
Correct Answer: A
Solution :
Key Idea Basic nature \[\propto \] metallic nature \[\propto \] electropositive nature \[\propto \] atomic size \[\propto \frac{1}{no.\text{ }of\text{ }electron\text{ }in\text{ }outer\text{ }shell}\] The basicity of alkali metal hydroxide increase down the group because atomic size increase continuously and electropositive character also increases. Therefore, the basicity order of alkali metal hydroxide is as \[RbOH>KOH>NaOH>LiOH\]
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