IIT/JEE Chemistry Practice #33: Ranking Acidity

The video tutorial covers ranking problems based on acidity and pH. It begins with an introduction to the concepts of acid strength and pH. The first section explains how the electronegativity of halogens in oxyacids affects their acid strength. The second section discusses the impact of the number of oxygen atoms on acid strength. The final section ranks different salt solutions by their pH, explaining the neutrality of NaCl, the weak acidity of ammonium chloride, and the weak basicity of NaCN.

Which factor increases the acidity of oxyacids?

• Increasing number of hydrogen atoms

• Decreasing number of oxygen atoms

• Increasing electronegativity

• Decreasing electronegativity

What happens to the acidity of an oxyacid as the number of oxygen atoms increases?

• It decreases

• It increases

• It remains the same

• It becomes neutral

Which of the following salts is considered neutral?

• Hydrochloric acid

• Sodium cyanide

• Sodium chloride

• Ammonium chloride

Which salt is weakly acidic due to the presence of ammonium ions?

• Hydrochloric acid

• Sodium cyanide

• Ammonium chloride

• Sodium chloride

Which of the following has the highest pH?

• Sodium cyanide

• Sodium chloride

• Hydrochloric acid

• Ammonium chloride