why group 1 metal hydroxides are basic in nature ?

Dear Student,

Group 1 metal hydroxides are basic in nature. This is due to weak bond between M-OH. Alkali metals are larger in size, due to which the bond between M-OH is weak and thus the metal hydroxide easily ionise to M+ and OH-. Therefore, group 1 metal hydroxides are basic in nature. 

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When these hydroxides reacts with water they release OH- . This proves that they are basic in nature.
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