14 sci mh 9th

Which of the following is an example of a radioactive substance?

• Sodium chloride

• Uranium

• Calcium carbonate

• Magnesium sulfate

Which of the following is a base?

• Table salt

• Soap

• Iron

• Alum

What are ionic compounds that do not contain H⁺ or OH⁻ ions called?

• Acids

• Bases

• Simple salts

• Organic compounds

What is the primary component of common table salt?

• NaOH

• Na₂SO₄

• NaCl

• CaCl₂

What is the main use of alum in daily life?

• Cooking

• Water purification

• Cleaning clothes

• Fertilizer

Which of the following is classified as a metal?

• Sulfur

• Iron

• Oxygen

• Carbon

Which of the following is NOT an example of an inorganic salt?

• Na₂SO₄

• K₃PO₄

• C₆H₁₂O₆

• CaCl₂

What is the chemical formula of baking soda?

• Na₂CO₃

• NaHCO₃

• CaCO₃

• NH₄Cl

Which substance is used in toothpaste to prevent tooth decay?

• Sodium chloride

• Calcium carbonate

• Fluoride compounds

• Sulfur

What is the role of sulfur in daily life?

• Used in fertilizers

• Used as a preservative

• Used in gunpowder

• All of the above