Separation Techniques Quiz

A mixture of sand and iron filings can be separated by:

• Filtration

• Magnetic separation

• Heating

• Electrolysis

A mixture whose components cannot be distinguished by the naked eye is called:

• Compound

• Element

• Homogeneous mixture

• Heterogeneous mixture

The mixture of sand and water can be separated by:

• Evaporation

• Filtration

• Condensation

• Freezing

The solution of table salt and water can be separated by:

• Magnetic separation

• Evaporation and condensation

• Filtration

• Heating only

A pure substance that cannot be decomposed by physical or chemical methods is:

• Mixture

• Compound

• Element

• Solution

When red mercury oxide is heated, it decomposes into:

• Hydrogen and water

• Mercury and oxygen

• Carbon and oxygen

• Hydrogen and carbon

The molecular formula of methane is:

• HNO₃

• CH₄

• H₂SO₄

• CO₂

The number of metal atoms in one molecule of Egyptian blue dye (CaCuSi₄O₁₀) is:

• 2

• 4

• 10

• 15

Organic compounds are called carbon compounds because:

• They always contain oxygen

• Carbon is a main component

• They can’t dissolve in water

• They contain metal atoms

The organic compound that contains carbon and hydrogen only is:

• Nitric acid

• Methane

• Carbon dioxide

• Water