Mole and Molarity Calculations MCQs

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  1. One mole of a substance contains:
    A) 6.02 × 10²² particles
    B) 6.02 × 10²³ particles
    C) 6.02 × 10²⁴ particles
    D) 6.02 × 10²¹ particles
    Answer: B
  2. The molar mass of H₂O is:
    A) 16 g/mol
    B) 17 g/mol
    C) 18 g/mol
    D) 19 g/mol
    Answer: C
  3. Number of moles =
    A) Mass × molar mass
    B) Mass ÷ molar mass
    C) Molar mass ÷ mass
    D) Volume × molarity
    Answer: B
  4. Molarity is defined as:
    A) Moles of solute per kg of solvent
    B) Moles of solute per liter of solution
    C) Mass per liter
    D) Volume per mole
    Answer: B
  5. 1 mole of NaCl contains:
    A) 23 g
    B) 35.5 g
    C) 58.5 g
    D) 60 g
    Answer: C
  6. Avogadro’s number is:
    A) 6.02 × 10²²
    B) 6.02 × 10²³
    C) 6.02 × 10²¹
    D) 6.02 × 10²⁴
    Answer: B
  7. Molarity unit is:
    A) mol/kg
    B) mol/L
    C) g/L
    D) kg/mol
    Answer: B
  8. 2 moles of CO₂ contain how many molecules?
    A) 6.02 × 10²³
    B) 1.204 × 10²⁴
    C) 3.01 × 10²³
    D) 2 × 10²³
    Answer: B
  9. The molar mass of CO₂ is:
    A) 42 g/mol
    B) 44 g/mol
    C) 46 g/mol
    D) 40 g/mol
    Answer: B
  10. Moles in 36 g of H₂O:
    A) 1
    B) 2
    C) 3
    D) 0.5
    Answer: B
  11. Formula for molarity:
    A) M = moles/volume (L)
    B) M = volume/moles
    C) M = mass × volume
    D) M = molar mass/volume
    Answer: A
  12. Volume must be in:
    A) mL
    B) cm³
    C) Liters
    D) grams
    Answer: C
  13. 0.5 M solution means:
    A) 0.5 g solute
    B) 0.5 moles per liter
    C) 0.5 L solution
    D) 0.5 kg solvent
    Answer: B
  14. Moles of NaCl in 117 g:
    A) 1
    B) 2
    C) 3
    D) 0.5
    Answer: B
  15. 1 mole of O₂ weighs:
    A) 16 g
    B) 32 g
    C) 48 g
    D) 28 g
    Answer: B
  16. Number of atoms in 1 mole of He:
    A) 6.02 × 10²³
    B) 3.01 × 10²³
    C) 1.2 × 10²³
    D) 2 × 10²³
    Answer: A
  17. 0.25 moles equals:
    A) 1/2 mole
    B) 1/4 mole
    C) 3/4 mole
    D) 1 mole
    Answer: B
  18. 1 M solution means:
    A) 1 mole in 1 L
    B) 1 g in 1 L
    C) 1 kg in 1 L
    D) 1 mole in 100 mL
    Answer: A
  19. 2 L of 1 M solution contains:
    A) 1 mole
    B) 2 moles
    C) 3 moles
    D) 0.5 mole
    Answer: B
  20. Molarity depends on:
    A) Temperature
    B) Pressure
    C) Mass only
    D) Volume only
    Answer: A
  21. Dilution formula is:
    A) M₁V₁ = M₂V₂
    B) M₁ + M₂ = V
    C) M/V = constant
    D) V₁V₂ = M
    Answer: A
  22. 1 mole of glucose contains:
    A) 6.02 × 10²³ molecules
    B) 3 × 10²³
    C) 1 × 10²³
    D) 2 × 10²³
    Answer: A
  23. Molar mass of NaOH:
    A) 30 g/mol
    B) 40 g/mol
    C) 50 g/mol
    D) 35 g/mol
    Answer: B
  24. 0.1 M solution means:
    A) 0.1 mole/L
    B) 1 mole/L
    C) 10 mole/L
    D) 0.01 mole/L
    Answer: A
  25. Moles in 22 g CO₂:
    A) 0.5
    B) 1
    C) 2
    D) 0.25
    Answer: A
  26. 1 mole gas occupies (STP):
    A) 22.4 L
    B) 24 L
    C) 20 L
    D) 18 L
    Answer: A
  27. Molar mass of H₂SO₄:
    A) 96 g/mol
    B) 98 g/mol
    C) 100 g/mol
    D) 94 g/mol
    Answer: B
  28. Moles = particles /
    A) mass
    B) volume
    C) Avogadro’s number
    D) density
    Answer: C
  29. 3 moles of Na contain atoms:
    A) 6.02 × 10²³
    B) 1.8 × 10²⁴
    C) 3 × 10²³
    D) 2 × 10²⁴
    Answer: B
  30. Molarity decreases on:
    A) Heating
    B) Dilution
    C) Stirring
    D) Cooling
    Answer: B
  31. Volume = moles /
    A) mass
    B) molarity
    C) density
    D) temperature
    Answer: B
  32. 1 mole of N₂ weighs:
    A) 14 g
    B) 28 g
    C) 32 g
    D) 30 g
    Answer: B
  33. 0.5 L of 2 M solution contains:
    A) 1 mole
    B) 2 moles
    C) 0.5 mole
    D) 4 moles
    Answer: A
  34. Molarity unit alternative:
    A) mol/dm³
    B) g/cm³
    C) kg/mol
    D) L/mol
    Answer: A
  35. Moles in 11 g CO₂:
    A) 0.25
    B) 0.5
    C) 1
    D) 2
    Answer: A
  36. 2 M solution is:
    A) dilute
    B) concentrated
    C) neutral
    D) saturated
    Answer: B
  37. Molarity =
    A) mass × volume
    B) moles/volume
    C) volume/moles
    D) density × volume
    Answer: B
  38. Moles in 58.5 g NaCl:
    A) 0.5
    B) 1
    C) 2
    D) 3
    Answer: B
  39. Dilution increases:
    A) concentration
    B) molarity
    C) volume
    D) moles
    Answer: C
  40. 1 mole of CH₄ has molar mass:
    A) 14 g
    B) 16 g
    C) 18 g
    D) 12 g
    Answer: B
  41. 0.2 M means:
    A) 2 mol/L
    B) 0.2 mol/L
    C) 20 mol/L
    D) 0.02 mol/L
    Answer: B
  42. Molarity changes with:
    A) pressure
    B) temperature
    C) mass
    D) moles
    Answer: B
  43. Moles in 9 g H₂O:
    A) 0.5
    B) 1
    C) 2
    D) 3
    Answer: A
  44. Molarity is concentration in:
    A) solid
    B) gas
    C) solution
    D) plasma
    Answer: C
  45. 1 mole contains:
    A) atoms only
    B) molecules only
    C) particles
    D) ions only
    Answer: C
  46. Moles of solute stay same during:
    A) heating
    B) dilution
    C) freezing
    D) evaporation
    Answer: B
  47. Molar mass of NH₃:
    A) 15 g/mol
    B) 17 g/mol
    C) 18 g/mol
    D) 16 g/mol
    Answer: B
  48. 3 M solution means:
    A) 3 moles/L
    B) 3 g/L
    C) 3 kg/L
    D) 3 L/mol
    Answer: A
  49. Number of moles increases with:
    A) mass
    B) volume
    C) temperature
    D) pressure
    Answer: A
  50. Unit of mole is:
    A) kg
    B) mol
    C) L
    D) g
    Answer: B
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