Chemistry Quiz

Which of the following is a characteristic of an acid?

• Feels slippery

• Turns red litmus blue

• Has a sour taste

• Neutral pH

Which of these is a strong base?

• NaOH

• HCl

• CH₃COOH

• NH₄OH

A salt is formed when...

• A base reacts with water

• An acid reacts with a metal oxide

• A metal reacts with hydrogen

• A base is diluted

Which of the following is a salt?

• NaCl

• H₂SO₄

• NaOH

• NH₃

Litmus turns red in the presence of...

• Alkali

• Base

• Neutral solution

• Acid

What products are formed when an acid reacts with a base?

• Salt and water

• Acid and metal

• Gas and salt

• Metal and hydrogen

Temporary hardness in water is caused by the presence of...

• NaCl

• Ca(HCO₃)₂

• MgSO₄

• Fe₂O₃

Soft water lathers easily with soap because it lacks...

• Calcium and magnesium ions

• Salt and sugar

• Oxygen and nitrogen

• Iron and zinc

Which of the following methods removes temporary hardness of water?

• Filtration

• Distillation

• Boiling

• Addition of acids

Which compound causes permanent hardness?

• Ca(HCO₃)₂

• MgCl₂

• H₂SO₄

• CO₂