JAMB and WAEC Chemistry questions: Acids, bases and salts

58 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Acids, bases and salts· JAMB

   Which of the following is a basic salt?

   • ANaCl
   • BNaHSO₄
   • CMg(OH)Cl
   • DKNO₃

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   Explanation and discussion

2. Question 2· Acids, bases and salts· WAEC

   A solution with pH 9 is

   • Aweakly acidic
   • Bstrongly acidic
   • Cneutral
   • Dweakly alkaline

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3. Question 3· Acids, bases and salts· JAMB

   Which of the following is an amphoteric oxide?

   • ANa₂O
   • BAl₂O₃
   • CSO₂
   • DCaO

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4. Question 4· Acids, bases and salts· JAMB

   An amphoteric oxide reacts with

   • Aneither acids nor bases
   • Bacids only
   • Cbases only
   • Dboth acids and bases

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5. Question 5· Acids, bases and salts· JAMB

   Find the pH of a 0.001 mol/dm³ solution of sodium hydroxide, assuming complete ionisation.

   • A11
   • B3
   • C7
   • D14

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6. Question 6· Acids, bases and salts· JAMB

   A Lewis acid is

   • Aonly a proton donor
   • Ban electron-pair donor
   • Can electron-pair acceptor
   • Da hydroxide donor

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7. Question 7· Acids, bases and salts· JAMB

   Which of the following is an acid salt?

   • AKNO₃
   • BNaCl
   • CNa₂SO₄
   • DNaHSO₄

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   Explanation and discussion

8. Question 8· Acids, bases and salts· JAMB

   What mass of sodium hydroxide neutralises 0.1 mol of hydrochloric acid? (Na = 23, O = 16, H = 1)

   • A4 g
   • B40 g
   • C0.4 g
   • D8 g

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9. Question 9· Acids, bases and salts· JAMB

   The most suitable indicator for titrating a weak acid against a strong base is

   • Alitmus
   • Bmethyl orange
   • Cphenolphthalein
   • Dstarch

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10. Question 10· Acids, bases and salts· JAMB

    The most suitable indicator for titrating a strong acid against a weak base is

    • Amethyl orange
    • Bphenolphthalein
    • Clitmus
    • Duniversal indicator

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11. Question 11· Acids, bases and salts· JAMB

    Which of these salts gives an acidic solution in water?

    • Apotassium trioxonitrate(V)
    • Bsodium chloride
    • Csodium trioxocarbonate(IV)
    • Dammonium chloride

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    Explanation and discussion

12. Question 12· Acids, bases and salts· JAMB

    Find the pH of 0.01 mol/dm³ hydrochloric acid.

    • A2
    • B1
    • C12
    • D0.01

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13. Question 13· Acids, bases and salts· WAEC

    Baking soda used in cooking is

    • Asodium hydrogentrioxocarbonate(IV)
    • Bsodium chloride
    • Ccalcium oxide
    • Dammonium chloride

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14. Question 14· Acids, bases and salts· WAEC

    Hydrated salts lose water of crystallisation on exposure to air. This is

    • Asublimation
    • Bdeliquescence
    • Chygroscopy
    • Defflorescence

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15. Question 15· Acids, bases and salts· WAEC

    A salt formed when only part of the replaceable hydrogen of an acid is replaced by a metal is

    • Aa normal salt
    • Ban acid salt
    • Ca basic salt
    • Da double salt

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16. Question 16· Acids, bases and salts· WAEC

    Which of these is a weak acid?

    • Aethanoic acid
    • Bhydrochloric acid
    • Ctrioxonitrate(V) acid
    • Dtetraoxosulphate(VI) acid

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17. Question 17· Acids, bases and salts· WAEC

    An acid salt is formed when

    • Athe replaceable hydrogen of an acid is only partly replaced
    • Ball hydrogen is replaced
    • Can acid reacts with water
    • Da base dissolves

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18. Question 18· Acids, bases and salts· JAMB

    Which of the following salts is acidic in solution?

    • Asodium chloride
    • Bammonium chloride
    • Csodium trioxocarbonate(IV)
    • Dpotassium nitrate

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19. Question 19· Acids, bases and salts· WAEC

    25 cm³ of 0.1 mol/dm³ NaOH is neutralised by 20 cm³ of HCl. The concentration of the acid is

    • A0.1 mol/dm³
    • B0.08 mol/dm³
    • C0.125 mol/dm³
    • D0.25 mol/dm³

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20. Question 20· Acids, bases and salts· WAEC

    The pH of a 0.01 mol/dm³ solution of HCl is

    • A0.01
    • B1
    • C12
    • D2

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    Explanation and discussion