- Number of moles in 44 g of CO₂:
A) 0.5
B) 1
C) 2
D) 4
Answer: B - Molar mass of CaCO₃:
A) 90 g/mol
B) 100 g/mol
C) 110 g/mol
D) 95 g/mol
Answer: B - Moles in 100 g CaCO₃:
A) 0.5
B) 1
C) 2
D) 0.25
Answer: B - 1 mole of H₂ contains:
A) 1 atom
B) 2 atoms
C) 6.02 × 10²³ molecules
D) 3 × 10²³ atoms
Answer: C - Number of atoms in 1 mole of O₂:
A) 6.02 × 10²³
B) 1.2 × 10²⁴
C) 3 × 10²³
D) 2 × 10²³
Answer: B - 0.5 M solution in 2 L contains moles:
A) 0.5
B) 1
C) 2
D) 4
Answer: B - Molarity formula can also be written as:
A) M = mass/moles
B) M = moles × volume
C) M = moles/volume
D) M = volume/mass
Answer: C - Moles in 2 L of 3 M solution:
A) 3
B) 5
C) 6
D) 1
Answer: C - Volume of 1 mole gas at STP:
A) 24 L
B) 22.4 L
C) 20 L
D) 25 L
Answer: B - Molar mass of KCl:
A) 70.5 g/mol
B) 74.5 g/mol
C) 75.5 g/mol
D) 72.5 g/mol
Answer: B - Moles in 74.5 g KCl:
A) 0.5
B) 1
C) 2
D) 3
Answer: B - Molarity after dilution:
A) increases
B) decreases
C) constant
D) doubles
Answer: B - Moles in 0.25 L of 4 M solution:
A) 0.5
B) 1
C) 2
D) 4
Answer: B - Molar mass of MgSO₄:
A) 118 g/mol
B) 120 g/mol
C) 122 g/mol
D) 124 g/mol
Answer: B - Moles in 60 g MgSO₄:
A) 0.5
B) 1
C) 2
D) 0.25
Answer: A - Number of molecules in 0.5 mole:
A) 3.01 × 10²³
B) 6.02 × 10²³
C) 1 × 10²³
D) 2 × 10²³
Answer: A - Molarity depends on:
A) moles and volume
B) mass only
C) temperature only
D) pressure only
Answer: A - Unit of molarity:
A) mol/kg
B) mol/L
C) g/mol
D) kg/L
Answer: B - Moles in 98 g H₂SO₄:
A) 0.5
B) 1
C) 2
D) 3
Answer: B - Volume of 2 moles gas at STP:
A) 22.4 L
B) 44.8 L
C) 11.2 L
D) 20 L
Answer: B - 1.5 M solution means:
A) 1.5 g/L
B) 1.5 mol/L
C) 1.5 kg/L
D) 1.5 L/mol
Answer: B - Moles in 0.1 L of 2 M solution:
A) 0.1
B) 0.2
C) 2
D) 1
Answer: B - Molar mass of Al₂O₃:
A) 100 g/mol
B) 102 g/mol
C) 104 g/mol
D) 98 g/mol
Answer: B - Moles in 204 g Al₂O₃:
A) 1
B) 2
C) 3
D) 4
Answer: B - Number of atoms in 2 moles of He:
A) 6.02 × 10²³
B) 1.2 × 10²⁴
C) 2 × 10²³
D) 3 × 10²³
Answer: B - Dilution keeps constant:
A) volume
B) moles
C) molarity
D) temperature
Answer: B - Moles = M × V
A) True
B) False
C) Depends
D) None
Answer: A - Molar mass of HCl:
A) 35.5 g/mol
B) 36.5 g/mol
C) 37.5 g/mol
D) 38.5 g/mol
Answer: B - Moles in 73 g HCl:
A) 1
B) 2
C) 3
D) 0.5
Answer: B - Volume required for 2 moles in 1 M:
A) 1 L
B) 2 L
C) 3 L
D) 0.5 L
Answer: B - Molarity of 1 mole in 500 mL:
A) 1 M
B) 2 M
C) 0.5 M
D) 4 M
Answer: B - Convert 500 mL to L:
A) 0.5 L
B) 5 L
C) 50 L
D) 0.05 L
Answer: A - Moles in 36.5 g HCl:
A) 0.5
B) 1
C) 2
D) 3
Answer: B - Molar mass of Ca(OH)₂:
A) 72 g/mol
B) 74 g/mol
C) 76 g/mol
D) 78 g/mol
Answer: B - Moles in 74 g Ca(OH)₂:
A) 1
B) 2
C) 0.5
D) 3
Answer: A - Molarity =
A) mass × volume
B) moles/volume
C) volume/mass
D) density × volume
Answer: B - Moles in 18 g H₂O:
A) 1
B) 2
C) 3
D) 0.5
Answer: A - Number of molecules in 3 moles:
A) 6.02 × 10²³
B) 1.8 × 10²⁴
C) 3 × 10²³
D) 2 × 10²⁴
Answer: B - Molarity decreases when:
A) volume increases
B) moles increase
C) temperature decreases
D) pressure increases
Answer: A - Molarity of 2 moles in 2 L:
A) 2 M
B) 1 M
C) 0.5 M
D) 4 M
Answer: B - Moles in 0.2 L of 5 M solution:
A) 1
B) 0.5
C) 2
D) 5
Answer: A - Molar mass of Na₂CO₃:
A) 104 g/mol
B) 106 g/mol
C) 108 g/mol
D) 110 g/mol
Answer: B - Moles in 106 g Na₂CO₃:
A) 0.5
B) 1
C) 2
D) 3
Answer: B - 0.01 M is:
A) very concentrated
B) dilute
C) saturated
D) neutral
Answer: B - Molarity unit can be written as:
A) mol dm⁻³
B) g dm⁻³
C) kg mol⁻¹
D) L mol⁻¹
Answer: A - Moles in 10 L of 0.1 M solution:
A) 1
B) 0.1
C) 10
D) 5
Answer: A - Molarity of 0.5 moles in 250 mL:
A) 2 M
B) 1 M
C) 0.5 M
D) 4 M
Answer: A - Number of atoms in 1 mole of Na:
A) 6.02 × 10²³
B) 3 × 10²³
C) 2 × 10²³
D) 1 × 10²³
Answer: A - Moles = mass / molar mass
A) True
B) False
C) Depends
D) None
Answer: A - Mole concept is used to measure:
A) volume
B) mass
C) amount of substance
D) density
Answer: C
Pages: 1 2