Correct order of acidic strength is :

N a - O - H > K - O - H > R b - O - H

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N a - O - H < K - O - H < L i - O - H

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H - O K > H O - R b > N a - O - H

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None of these

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Solution

The correct option is A $N a - O - H > K - O - H > R b - O - H$
Down the group basic nature of hydroxides of alkali metals increases. Therefore, acidic nature of alkali metal hydroxides decreases; thus the correct order of acidic nature of hydroxides of alkali metals is

$N a - O - H > K - O - H > R b - O - H$
Hence option A is correct.

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