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Which is a Not scientific question?

What is the pH of a solution of potassium hydroxide?
Which base is the most exciting to study?
Will HF neutralize a solution of HCl?
Does adding sodium chloride change the pH of a solution?

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B. "Which base is the most exciting to study?"

Feel free to ask me more questions; I'm happy to help. (Don't forget Brainliest!)
3rd as HF and HCl both are acids,so they cannot neutralize each other