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Free pH and pOH MCQs with Answers

10 pH and pOH MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

pH measures hydrogen ion concentration and pOH measures hydroxide ion concentration on a logarithmic scale. Calculations use pH = minus log of hydrogen ion concentration, pOH = minus log of hydroxide ion concentration and pH plus pOH equals pKw, with separate treatment of strong and weak acids and bases.

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10 questions

1. K, is acid association constant, large PK,, value for an acid indicates that acid is:

  • A. Strong
  • B. weak
  • C. moderate
  • D. water soluble

Explanation: if KA is smaller than pKA is large which means weak acid

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Correct answer: weak

2. If 9.8 g of sulfuric acid is dissolved in an excess quantity of water, it will yield _ moles of hydrogen ion ( H+) and _ mole of sulphate ions (SO4 -2).

  • A. 0.1, 0.2
  • B. 0.1, 0.3
  • C. 0.2, 0.4
  • D. 0.2, 0.1

Explanation: 9.8 grams of sulphuric acid is 0.1 moles so there will be 0.2 moles of hydrogen ions ( two hydrogens per sulphuric acid molecule) H2SO4…

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Correct answer: 0.2, 0.1

3. Which material possesses the highest pH?

  • A. Soft drinks
  • B. Bananas
  • C. Milk of magnesia
  • D. Sea water

Explanation: The basic pH of milk of magnesia helps neutralize overactive stomach acids that cause heartburn.

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Correct answer: Milk of magnesia

4. 0.1 mole of acetic acid has been dissolved per dm3 of the solution, the percentage ionization of acetic acid will be

  • A. 13
  • B. 15
  • C. 1.3
  • D. 0.1

Explanation: A, B and D are incorrect because these are not correct percentage ionization valuesC is correct since The solution is given as CH3COOH…

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Correct answer: 1.3

5. The 'pH' of human blood is:

  • A. 6.7 - 8
  • B. 7.9
  • C. 7.5
  • D. 7.35 - 7.4

Explanation: The pH of human blood is typically around 7.35 to 7.45, which is slightly alkaline or basic.

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Correct answer: 7.35 - 7.4

6. Which one f the following has the lowest pH?

  • A. 1 M HF
  • B. 1 M HCL
  • C. 1 m CH3COOH
  • D. 1 M NaOH

Explanation: As we know that lower the pH, stronger the acid and greater the no of hydrogen ions in a solution.

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Correct answer: 1 m CH3COOH

7. What is the concentration of [H+] in the HNO3 acid solution with a PH of 3?

  • A. 3
  • B. -3
  • C. - antilog [3]
  • D. 10^-3

Explanation: pH is defined as the negative logarithm of the hydrogen ion concentration [H+].

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Correct answer: 10^-3

8. Milk of magnesia is used for treatment of acidity in stomach, its formula is:

  • A. Mg(OH)2
  • B. MgSO4
  • C. Ca(OH)2
  • D. CaSO4

Explanation: Milk of magnesia is a suspension of magnesium hydroxide, with the chemical formula Mg(OH)2.

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Correct answer: Mg(OH)2

9. What is the concentration moles/liter of nitric acid solution having PH of 4?

  • A. 0.0001 mol/L
  • B. -4
  • C. 10-4 mol/L
  • D. 10-10

Explanation: To determine the concentration of nitric acid in moles per liter with a pH of 4, we apply the formula: pH = -log[H+].

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Correct answer: 0.0001 mol/L

10. If the pH of the solution is 9 its OH− ions concentration is:

  • A. 10−5
  • B. 5
  • C. 10−9
  • D. 9

Explanation: As we know that,pH+pOH=14pOH=14-9=5Also, pOH=log[OH-][OH-]=antilog(pOH)[OH]=antilog (5)[OH]=10-5

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Correct answer: 10−5
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pH and pOH MCQs: common questions

Are these pH and pOH MCQs free?

Yes. All pH and pOH MCQs from Chemistry are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.

How many pH and pOH MCQs are on this page?

There are 10 pH and pOH MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.

Does every pH and pOH MCQ have an explanation?

Yes. Each pH and pOH question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.

Can I take a timed pH and pOH test?

Yes. The practice button on this page starts a free pH and pOH test drawn from the Chemistry bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.