A) \[\text{1}{{\text{0}}^{4}}\]
B) \[\text{1}{{\text{0}}^{10}}\]
C) \[{{10}^{-4}}\]
D) \[{{10}^{-10}}\]
Correct Answer: C
Solution :
\[pH=4\] \[[{{H}^{+}}]={{10}^{-pH}}\] \[={{10}^{-4}}\]
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