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  1. Which could be true about an unknown sample with a pH of 7? (2 points)

It contains only water.

It is highly acidic.

It has a very high hydroxide ion concentration.

It is a solution of HF and water

Verified Answer :

The best and most correct answer among the choices provided by your question is the first choice or letter A.

A ph of 7 contains only water.

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Answer: Option (a) is the correct answer.

Explanation:

Substance which show pH less than 7 are acidic in nature. For example, HCl being a strong acid has pH very less than 7.

Substances which show pH greater than 7 are basic in nature. For example, NaOH being basic in nature has pH greater than 7.

Whereas substances which have pH equal to 7 are neutral in nature, that is, they are neither acidic nor basic.

For example, water is neutral in nature.

Thus, we can conclude that the statement it contains only water is true about an unknown sample with a pH of 7.

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