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Question 1:

What does pH measure?

A) Temperature of a solution
B) Concentration of hydrogen ions in a solution
C) Concentration of hydroxide ions in a solution
D) Viscosity of a solution

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Explanation: The correct answer is B) Concentration of hydrogen ions in a solution. pH is a measure of the concentration of hydrogen ions (H+) in a solution. It indicates the acidity or alkalinity of a solution on a logarithmic scale ranging from 0 to 14.

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Question 2:

What is the pH value of a neutral solution?

A) pH 0
B) pH 7
C) pH 14
D) pH 10

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Explanation: The correct answer is B) pH 7. A neutral solution has a pH of 7. It indicates a balanced concentration of hydrogen ions (H+) and hydroxide ions (OH-) in the solution.

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Question 3:

Which of the following is a pH range for acidic solutions?

A) pH 1-3
B) pH 7-9
C) pH 10-12
D) pH 13-14

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Explanation: The correct answer is A) pH 1-3. pH 1-3 is the pH range for acidic solutions. It indicates a higher concentration of hydrogen ions (H+) in the solution, resulting in increased acidity.

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Question 4:

Which of the following is a pH range for alkaline solutions?

A) pH 0-2
B) pH 4-6
C) pH 7-9
D) pH 11-13

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Explanation: The correct answer is D) pH 11-13. pH 11-13 is the pH range for alkaline solutions. It indicates a higher concentration of hydroxide ions (OH-) in the solution, resulting in increased alkalinity.

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Question 5:

Which pH indicator is commonly used for pH measurement in the range of 6-8?

A) Methyl orange
B) Phenolphthalein
C) Bromothymol blue
D) Litmus paper

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Explanation: The correct answer is C) Bromothymol blue. Bromothymol blue is commonly used as a pH indicator for measuring pH in the range of 6-8. It changes color from yellow (acidic) to blue (basic) within this pH range.