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The `pH` of a `0.01 M` solution of a monobasic acid is four. Which one of the following statement about the acid is incorrectA. When a little `NaOH` is added, it will form a buffer solutionB. It is a weak acidC. Its sodium salt will be acidicD. Its sodium salt will be basic |
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Answer» Correct Answer - C Concentration of monobasic acid `= 0.01 M` `pH=4` If the acid is completely ionised, the `pH` of the acid would be `pH= -log0.01= -log10^(-2)=2` So it is a weak acid. When the sodium salt of a weak acid is dissolved , the anions will be hydrolysed giving rise to `OH^(-)ion` concentration. The solution will be basic . So statement (`c`) is incorrect. |
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