Chemistry Chapter 13 Short Questions For Class 11

These are the most important Chemistry chapter 13 short questions for Class 11. The 1st-year chapter 13 of Chemistry is related to reaction kinetics. These questions are for the Punjab Textbook Board and can be used within all of Punjab where this syllabus is taught.

Students are advised to prepare these questions in order to perform the best in the board examination.

Chemistry Chapter 13 Short Questions for Class 11

Which halogen is the least reactive, which is the most reactive? Give reason.
The ionic equation for a reaction is: Br₂ + 2I⁻ → Br⁻ + I₂. Explain which species is oxidized in this reaction. Why?
What is the role of London dispersion forces in the trend of volatility of halogens?
How does the reactivity of halogens with hydrogen vary?
Which halogen is used as an antiseptic? How does it work?
What is the colour change when chlorine displaces bromine?
How are the halogen acids ionized in water?
Why is HF a weaker acid than HCl?
Describe a simple chemical test that could be used to distinguish between aqueous solutions of potassium bromide and potassium iodide. Include the reagents and expected observations.
Explain the chemical principles behind the use of chlorine as a disinfectant in water purification. Include relevant chemical equations in your explanation.
Describe one significant disadvantage associated with the use of chlorine in water purification.
What is a disproportionation reaction? Give an example.
Chlorine gas reacts differently with sodium hydroxide solution depending on the temperature and concentration. Explain.
Write balanced chemical equations for the reaction of chlorine (Cl₂) with:
i) Cold, dilute sodium hydroxide (NaOH). ii) Hot, concentrated sodium hydroxide (NaOH).
For each reaction in question (n), identify the oxidation states of chlorine in the reactant (Cl₂) and in each of the chlorine-containing products. Use these oxidation states to explain why both reactions are classified as disproportionation reactions.
The reducing power of halide ions decreases in the order: I⁻ > Br⁻ > Cl⁻ > F⁻. Give reason.
The thermal stability of hydrogen halides decreases down the group. Why?
Bond strength in halogens decreases as we move down the group from chlorine to iodine. Why?
The thermal stability of hydrogen halides decreases down the group. Why? (Explain in terms of intermolecular forces and physical states of halogens.)
The reactivity of halogens with hydrogen decreases down the group. Why?
What is a disproportionation reaction?
The thermal stability of hydrogen halides decreases down the group. Why? (Reaction of Cl₂ with cold aqueous NaOH — explain with oxidation states.)
What happens when chlorine reacts with water?
How do pH and chlorine dose affect the disinfection?
Write reaction of halides with concentrated sulphuric acid.