JAMB Chemistry questions

443 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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2. Question 2· Acids, bases and salts· JAMB

   Which of the following is an amphoteric oxide?

   • ANa₂O
   • BAl₂O₃
   • CSO₂
   • DCaO

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3. Question 3· 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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4. Question 4· 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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5. Question 5· 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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6. Question 6· Acids, bases and salts· JAMB

   Which of the following is an acid salt?

   • AKNO₃
   • BNaCl
   • CNa₂SO₄
   • DNaHSO₄

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7. Question 7· 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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8. Question 8· 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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9. Question 9· 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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10. Question 10· 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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11. Question 11· Acids, bases and salts· JAMB

    Find the pH of 0.01 mol/dm³ hydrochloric acid.

    • A2
    • B1
    • C12
    • D0.01

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12. Question 12· 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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13. Question 13· Acids, bases and salts· JAMB

    Which salt is best prepared by precipitation (double decomposition)?

    • Asodium chloride
    • Bbarium tetraoxosulphate(VI)
    • Cpotassium trioxonitrate(V)
    • Dammonium chloride

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

    A normal salt is one in which

    • Asome hydrogen remains replaceable
    • Ball the replaceable hydrogen of the acid has been replaced
    • Chydroxide ions remain
    • Dno metal is present

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

    A solution of pH 3 is:

    • Astrongly alkaline
    • Bweakly alkaline
    • Cacidic
    • Dneutral

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

    Efflorescent substances

    • Alose water of crystallisation to the air
    • Babsorb water from the air
    • Cdissolve in absorbed water
    • Dare always anhydrous

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

    Which oxide dissolves in water to form an acidic solution?

    • AMgO
    • BNa₂O
    • CCaO
    • DSO₂

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

    25 cm³ of 0.1 mol/dm³ hydrochloric acid is mixed with 25 cm³ of 0.1 mol/dm³ sodium hydroxide. The resulting solution is

    • Aneutral
    • Bacidic
    • Calkaline
    • Dsaturated

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

    A solution of sodium trioxocarbonate(IV) in water is alkaline because of

    • Aevaporation
    • Bthe sodium ion being acidic
    • Cdissolved oxygen
    • Dhydrolysis of the trioxocarbonate(IV) ion

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

    A solution with a pH of 13 is

    • Astrongly alkaline
    • Bweakly acidic
    • Cneutral
    • Dstrongly acidic

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    Explanation and discussion