A) \[4M\]
B) \[{{10}^{4}}M\]
C) \[{{10}^{-4}}M\]
D) \[{{10}^{-1}}M\]
Correct Answer: C
Solution :
\[pH=-\log [{{H}^{+}}]\] or \[[{{H}^{+}}]=1\times {{10}^{-pH}}\] For a solution of pH 4, \[[{{H}^{+}}]=1\times {{10}^{-4}}M\]
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