Chemistry Quiz

Which of the following gases can be collected by the downward displacement of air?

• Hydrogen

• Oxygen

• Ammonia

• Carbon dioxide

The periodic law states that the properties of elements are a periodic function of their:

• Atomic size

• Atomic number

• Mass number

• Electronegativity

What is the oxidation state of sulfur in H₂SO₄?

• +2

• +4

• +6

• -2

Which of the following is a property of transition metals?

• They have low melting points

• They form colored compounds

• They are poor conductors of electricity

• They do not exhibit variable oxidation states

Which of the following compounds will react with both acids and bases?

• Sodium chloride

• Calcium carbonate

• Aluminum hydroxide

• Copper(II) sulfate

Which of the following reactions represents neutralization?

• NaOH + HCl → NaCl + H₂O

• 2H₂ + O₂ → 2H₂O

• CaCO₃ → CaO + CO₂

• Fe + S → FeS

Which method is suitable for separating a mixture of salt and sand?

• Filtration

• Sublimation

• Chromatography

• Distillation

The type of reaction in which an element displaces another from its compound is called:

• Addition reaction

• Decomposition reaction

• Displacement reaction

• Neutralization reaction

What is the percentage composition of oxygen in water (H₂O)?

• 33.3%

• 66.7%

• 88.9%

• 44.4%

Which of the following is a reducing agent?

• KMnO₄

• H₂SO₄

• NaOH

• CO