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Question:

A solution contains 0.1 molar hydrogen ions (H+). This means the solution is likely:

A Around pH 1.0
Explaination

If a solution contains hydrogen ions, then it will be acidic, which means low pH. We can calculate the pH with the pH equation, where pH = -log (H+), or we can use our intuition. 0.1 molarity of ions is quite strong, and we would expect it to be a strong acid, which would mean it must be below pH 2.0.