Acid Base And Salt Quiz Questions And Answers

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Chemistry Expert
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Acid Base And Salt Quiz Questions And Answers - Quiz

Have you studied acids, bases, and salts in Chemistry? Then why not take this acid, base, and salt quiz we have specially prepared for you? Our quiz can be perfect if you want a way to test out just how much you know about them. For you to pass this quiz, you will need to have some knowledge of formulas for different acids, salts, and bases and their properties. Give it a shot, and feel free to take the quiz as many times as you need to and share it with others.


Questions and Answers
  • 1. 

    Which of the following pH values corresponds to that of a basic solution?  

    • A.

      3

    • B.

      5

    • C.

      7

    • D.

      9

    Correct Answer
    D. 9
    Explanation
    A pH value of 9 corresponds to a basic solution. The pH scale ranges from 0 to 14, with values below 7 indicating acidity, 7 being neutral, and values above 7 indicating alkalinity or basicity. Therefore, a pH value of 9 falls on the alkaline side of the scale, indicating that the solution is basic.

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  • 2. 

    Which of the following can form a two-acid salt?  

    • A.

      HCl

    • B.

      HNO3

    • C.

      H2SO4

    • D.

      H3PO4

    Correct Answer
    D. H3PO4
    Explanation
    H3PO4 can form two acid salts because it has three acidic hydrogen atoms. When one or two of these hydrogen atoms are replaced by a metal, such as sodium or potassium, two different acid salts can be formed. This is because each replacement of a hydrogen atom creates a different compound with unique properties and characteristics.

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  • 3. 

    Which of the following acids will dissociate completely in an aqueous solution?  

    • A.

      Hydrochloric acid

    • B.

      Carbonic acid

    • C.

      Acetic acid

    • D.

      Formic acid

    Correct Answer
    A. Hydrochloric acid
    Explanation
    Hydrochloric acid will dissociate completely in an aqueous solution because it is a strong acid. Strong acids are those that completely dissociate into ions when dissolved in water. Hydrochloric acid, with the chemical formula HCl, is a strong acid that ionizes into H+ and Cl- ions in water. This complete dissociation allows it to readily react with other substances in the solution. In contrast, carbonic acid, acetic acid, and formic acid are weak acids that only partially dissociate in water.

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  • 4. 

    Which of the following acids is a dibasic acid?  

    • A.

      HCOOH

    • B.

      H2SO4

    • C.

      HNO3

    • D.

      HNO2

    Correct Answer
    B. H2SO4
    Explanation
    H2SO4 is a dibasic acid because it has two ionizable hydrogen atoms. Dibasic acids are capable of donating two hydrogen ions in solution. In H2SO4, both hydrogen atoms can be ionized to form H+ ions, making it a dibasic acid. HCOOH, HNO3, and HNO2 are all monobasic acids because they only have one ionizable hydrogen atom.

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  • 5. 

    Which of the following is a diacidic base?

    • A.

      Sodium hydroxide

    • B.

      Potassium hydroxide

    • C.

      Ammonium hydroxide

    • D.

      Calcium hydroxide

    Correct Answer
    D. Calcium hydroxide
    Explanation
    Calcium hydroxide is a diacidic base because it can donate two hydroxide ions (OH-) when it reacts with an acid. This property makes it capable of neutralizing two moles of acid per mole of calcium hydroxide. Sodium hydroxide, potassium hydroxide, and ammonium hydroxide are all monobasic bases, meaning they can donate only one hydroxide ion.

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  • 6. 

    Which of the following is an acid salt?

    • A.

      K2SO4

    • B.

      (NH4)2SO4

    • C.

      KH2PO4

    • D.

      K3PO4

    Correct Answer
    C. KH2PO4
    Explanation
    KH2PO4 is an acid salt because it is derived from a weak acid (phosphoric acid) and a strong base (potassium hydroxide). It contains the hydrogen ion from the acid, making it acidic, but also has the ability to form basic ions due to the presence of the potassium ion. This combination of acidic and basic properties classifies KH2PO4 as an acid salt.

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  • 7. 

    Which of the following statements is wrong?

    • A.

      A weak acid dissociates incompletely.

    • B.

      The solution of a salt of a weak acid and strong base is alkaline.

    • C.

      The solution of a salt of a weak acid and a strong base is neutral.

    • D.

      A monobasic acid cannot form an acid salt.

    Correct Answer
    C. The solution of a salt of a weak acid and a strong base is neutral.
    Explanation
    The statement "The solution of a salt of a weak acid and a strong base is neutral" is incorrect. When a weak acid reacts with a strong base to form a salt, the resulting solution is usually slightly basic. This is because the weak acid does not completely dissociate, and some of the conjugate base from the weak acid remains in the solution, making it slightly basic. Therefore, the correct answer is "The solution of a salt of a weak acid and a strong base is alkaline."

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  • 8. 

    An efflorescent salt 

    • A.

      Is anhydrous salt that absorbs moisture from the air

    • B.

      Is a hydrated salt that loses its water to the atmosphere

    • C.

      Turns blue litmus red

    • D.

      Turns red litmus blue

    Correct Answer
    B. Is a hydrated salt that loses its water to the atmosphere
    Explanation
    An efflorescent salt is a hydrated salt that loses its water to the atmosphere. This means that the salt contains water molecules within its crystal structure, but when exposed to air, the water evaporates, leaving behind the anhydrous form of the salt. This process is known as efflorescence.

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  • 9. 

    Which of the following oxide is not an alkali?

    • A.

      Ammonium hydroxide

    • B.

      Calcium hydroxide

    • C.

      Copper hydroxide

    • D.

      Sodium hydroxide

    Correct Answer
    C. Copper hydroxide
    Explanation
    Copper hydroxide is not an alkali because it does not belong to the group of alkali metals. Alkali metals include elements such as sodium and potassium, which form hydroxides that are highly basic and soluble in water. Copper hydroxide, on the other hand, is a transition metal compound that is less basic and less soluble in water compared to alkali metal hydroxides.

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  • 10. 

    The more acidic a solution, the higher is its pH.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is false because the more acidic a solution is, the lower its pH value will be. pH is a measure of the concentration of hydrogen ions in a solution, and as the concentration of hydrogen ions increases, the acidity of the solution increases and the pH value decreases. Therefore, a higher acidity corresponds to a lower pH value.

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  • 11. 

    In a solution with pH-13, ammonium salt is added and gently heated.

    • A.

      It will liberate a gas that is acidic in nature and turns moist litmus paper red

    • B.

      It will liberate basic gas, which gives a dense white fume when a rod dipped in HCl is brought near it.

    • C.

      Precipitate forms, which is insoluble in all mineral acid

    • D.

      No reaction takes place

    Correct Answer
    B. It will liberate basic gas, which gives a dense white fume when a rod dipped in HCl is brought near it.
    Explanation
    When ammonium salt is added to a solution with pH-13 and gently heated, it will liberate a basic gas. This gas is capable of reacting with HCl, producing dense white fumes. This observation indicates that the gas is alkaline in nature. Therefore, the correct answer is that it will liberate basic gas, which gives dense white fume when a rod dipped in HCl is brought near it.

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  • 12. 

    Two sulfates which are insoluble (choose the correct pair)

    • A.

      Lead(II) sulfate/ammonium sulfate

    • B.

      Ammonium sulfate/sodium sulfate

    • C.

      Barium sulfate/lead (II) sulfate

    • D.

      Sodium sulfate/ potassium sulfate

    Correct Answer
    C. Barium sulfate/lead (II) sulfate
    Explanation
     Barium sulfate and lead (II) sulfate are the correct pair of insoluble sulfates. When these two compounds are mixed in water, they do not dissolve and form a precipitate. This is due to the low solubility of both compounds in water. The insolubility of these sulfates can be attributed to the strong ionic bonds present in their crystal structures, which make it difficult for them to break apart and dissolve in water. Therefore, when barium sulfate and lead (II) sulfate are mixed in water, they remain as solid particles, indicating their insolubility.

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  • 13. 

    A given white crystalline salt was tested as follows: a. It dissolves in water, and the resulting solution of the salt turns blue, litmus red b. The addition of barium chloride solution into this solution gives a white precipitate c. A flame test on the salt gave a persistent golden-yellow colorization. Identify the salt 

    • A.

      Potassium sulfate

    • B.

      Ammonium sulfate

    • C.

      Sodium sulfate

    • D.

      Sodium chloride

    Correct Answer
    C. Sodium sulfate
    Explanation
    The given white crystalline salt dissolves in water, turning the solution blue litmus red. This indicates that the salt is acidic. When barium chloride solution is added to the solution, a white precipitate is formed. This confirms the presence of sulfate ions in the salt. Lastly, a flame test on the salt produces a persistent golden-yellow colorization, indicating the presence of sodium ions. Therefore, the salt is sodium sulfate.

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  • 14. 

    "Conc. H2SO4, when reacted with sodium chloride, liberates HCl gas as the product " Which property of conc. Sulfuric acid is depicted by the mentioned reaction 

    • A.

      Oxidizing nature

    • B.

      Acidic nature

    • C.

      Non-volatile nature

    • D.

      Both acidic and oxidizing nature

    Correct Answer
    C. Non-volatile nature
    Explanation
    The given reaction shows that when concentrated sulfuric acid (H2SO4) reacts with sodium chloride (NaCl), it liberates HCl gas as the product. This indicates that the sulfuric acid is non-volatile in nature. Volatility refers to the tendency of a substance to vaporize or evaporate. Since the reaction does not produce any volatile substances, it suggests that the sulfuric acid is non-volatile.

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  • 15. 

    Choose the correct option from the following.

    • A.

      Universal indicator is a class of compound that shows distinctly different colors in acidic and alkaline solution.

    • B.

      Acid-Base indicators show different colors at different pH values.

    • C.

      A universal indicator is a class of compounds that show different colors at different pH values.

    • D.

      Methyl orange is a universal indicator.

    Correct Answer
    C. A universal indicator is a class of compounds that show different colors at different pH values.
    Explanation
    The given statement accurately describes a universal indicator. Universal indicators are compounds that exhibit different colors at different pH values, allowing them to be used to determine the acidity or alkalinity of a solution. Methyl orange, on the other hand, is a specific acid-base indicator that changes color at a specific pH range, not a universal indicator.

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  • 16. 

    Sodium carbonate, when treated with a solution, liberates a gas that turns lime-water milky and has no effect on acidified potassium dichromate solution. Choose the correct conclusion from the above observation.

    • A.

      The pH of the solution less than 7

    • B.

      Gas liberated is carbon dioxide

    • C.

      Both the above observation is correct

    • D.

      The pH of the solution is more than 7

    Correct Answer
    C. Both the above observation is correct
    Explanation
    Based on the given observation, sodium carbonate liberates a gas that turns lime-water milky and has no effect on acidified potassium dichromate solution. This suggests that the gas liberated is carbon dioxide, as carbon dioxide is known to turn lime-water milky. Lime water contains calcium hydroxide, and combining calcium hydroxide with carbon dioxide forms calcium carbonate as a precipitate, making the solution appear milky. Additionally, since the gas has no effect on the acidified potassium dichromate solution, it indicates that the pH of the solution is less than 7. Therefore, the correct conclusion is that both observations are correct.

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  • 17. 

    In an acid, the acidic hydrogen is bonded to an atom less electronegative than itself.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is false because in an acid, the acidic hydrogen is bonded to an atom that is more electronegative than itself. This is because acids are substances that can donate protons (H+ ions), and the hydrogen atom in an acid is typically bonded to an electronegative atom such as oxygen or a halogen. The electronegativity difference between the hydrogen and the electronegative atom creates a polar bond, allowing the acidic hydrogen to be easily released as a proton.

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  • 18. 

    What color change is observed when litmus paper is dipped in ammonium sulfate solution? 

    • A.

      No appreciable color change

    • B.

      Moist litmus paper turns red

    • C.

      Moist litmus paper turns blue

    • D.

      None of the above

    Correct Answer
    B. Moist litmus paper turns red
    Explanation
    When litmus paper is dipped in an ammonium sulfate solution, a color change is observed. Litmus paper is typically blue in its natural state, but when it comes into contact with an acidic substance like ammonium sulfate, it turns red. This is because litmus paper is a pH indicator and changes color depending on the acidity or alkalinity of the solution it is exposed to. In this case, the ammonium sulfate solution is acidic, causing the litmus paper to turn red.

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  • 19. 

    Choose the correct option. A Tribasic acid forms 

    • A.

      One acidic and one normal salt

    • B.

      Three acidic salts

    • C.

      One normal and two acidic salts

    • D.

      Forms only normal salts

    Correct Answer
    C. One normal and two acidic salts
    Explanation
    Tribasic acid forms one normal and two acidic salts because it has three replaceable hydrogen atoms. When all three hydrogen atoms are replaced by metal ions, a normal salt is formed. However, when only one or two hydrogen atoms are replaced, acidic salts are formed. Therefore, the correct answer is one normal and two acidic salts.

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Zohra Sattar |PhD, Chemistry |
Chemistry Expert
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
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