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The pH value of a 10 M solution of HCl is:

1. less than 0
2. equal to 0
3. equal to 1
4. equal to 2

Correct answer: less than 0

Solution

The pH is calculated as -log[H+]. For a 10 M HCl solution, [H+] = 10 M, so pH = -log(10) = -1, which is less than 0.

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