JAMB Chemistry questions

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

1. Question 81· Atomic structure and bonding· JAMB

   The bond in sodium chloride is:

   • Acovalent
   • Bmetallic
   • Cionic
   • Dhydrogen

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2. Question 82· Atomic structure and bonding· JAMB

   The configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ belongs to

   • Asodium
   • Bpotassium
   • Ccalcium
   • Dargon

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3. Question 83· Atomic structure and bonding· JAMB

   The electronic configuration of the calcium ion, Ca²⁺ (atomic number 20), is

   • A2, 8, 8, 2
   • B2, 8, 8
   • C2, 8, 10
   • D2, 8, 6

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4. Question 84· Atomic structure and bonding· JAMB

   Which element has the highest electronegativity?

   • Achlorine
   • Bfluorine
   • Coxygen
   • Dsodium

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5. Question 85· Atomic structure and bonding· JAMB

   Which of the following contains a dative (coordinate) covalent bond?

   • ACH₄
   • BNH₄⁺
   • CNaCl
   • DH₂

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6. Question 86· Atomic structure and bonding· JAMB

   Which molecule has a tetrahedral shape?

   • ACH₄
   • BCO₂
   • CH₂O
   • DBF₃

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7. Question 87· Chemical combination· JAMB

   What mass of oxygen combines with 4 g of hydrogen to form water? (H = 1, O = 16)

   • A8 g
   • B32 g
   • C16 g
   • D64 g

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8. Question 88· Chemical combination· JAMB

   Find the percentage by mass of nitrogen in NH₄NO₃. (N = 14, H = 1, O = 16)

   • A35%
   • B17.5%
   • C28%
   • D46.7%

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9. Question 89· Chemical combination· JAMB

   In the reaction 2KClO₃ → 2KCl + 3O₂, how many moles of oxygen are produced from 2 mol of KClO₃?

   • A1.5 mol
   • B2 mol
   • C3 mol
   • D6 mol

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10. Question 90· Chemical combination· JAMB

    How many molecules are in 4.4 g of carbon(IV) oxide? [C = 12, O = 16, L = 6.0 × 10²³]

    • A1.2 × 10²³
    • B6.0 × 10²³
    • C2.6 × 10²⁴
    • D6.0 × 10²²

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11. Question 91· Chemical combination· JAMB

    The law of definite proportions states that

    • Aa pure compound always contains the same elements combined in the same proportion by mass
    • Bmatter is neither created nor destroyed
    • Cgases combine in simple volume ratios
    • Dequal volumes of gases contain equal numbers of molecules

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12. Question 92· Chemical combination· JAMB

    How many molecules are in 2 mol of nitrogen gas? (Avogadro's constant = 6.02 × 10²³ mol⁻¹)

    • A6.02 × 10²³
    • B1.204 × 10²⁴
    • C3.01 × 10²³
    • D2.408 × 10²⁴

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13. Question 93· Chemical combination· JAMB

    What mass of sodium hydroxide is needed to prepare 250 cm³ of a 0.2 mol/dm³ solution? [Na = 23, O = 16, H = 1]

    • A2.0 g
    • B8.0 g
    • C0.2 g
    • D10 g

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14. Question 94· Chemical combination· JAMB

    What mass of carbon(IV) oxide is produced when 6 g of carbon burns completely in oxygen? (C = 12, O = 16)

    • A11 g
    • B44 g
    • C22 g
    • D28 g

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15. Question 95· Chemical combination· JAMB

    What mass of sodium chloride is formed when 46 g of sodium reacts completely with chlorine? (Na = 23, Cl = 35.5)

    • A81.5 g
    • B58.5 g
    • C117 g
    • D234 g

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16. Question 96· Chemical combination· JAMB

    What is the mass of 22.4 dm³ of carbon(IV) oxide at s.t.p.? (C = 12, O = 16)

    • A22 g
    • B44 g
    • C28 g
    • D88 g

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17. Question 97· Chemical combination· JAMB

    Gay-Lussac's law states that gases react in volumes that are

    • Aunrelated to each other
    • Balways equal
    • Cproportional to their masses
    • Din simple whole-number ratios at the same temperature and pressure

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18. Question 98· Chemical combination· JAMB

    How many moles of oxygen atoms are in 0.5 mol of carbon(IV) oxide?

    • A1 mol
    • B0.5 mol
    • C2 mol
    • D0.25 mol

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19. Question 99· Chemical combination· JAMB

    How many moles of oxygen atoms are present in 0.5 mol of CaCO₃?

    • A1.5
    • B0.5
    • C3
    • D1

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20. Question 100· Chemical combination· JAMB

    In the balanced equation aAl + bO₂ → cAl₂O₃, the values of a, b and c are

    • A2, 1 and 1
    • B2, 3 and 1
    • C4, 6 and 2
    • D4, 3 and 2

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