12th Chemistry Chapter 3 – 5 Mark Questions (Important & Repeated – TN Board)
Prepare for exams with 12th Chemistry Chapter 3 (p-Block Elements-II) important 5 mark questions. This collection includes most repeated and previously asked questions based on TN Board exams, helping students revise key concepts quickly and score better.
p-Block Elements-II – 5 Mark Questions
Most Repeated 5 Marks
Note : Number next to questions tells, how many times it has been repeated in past few years
1.Write the action of dil and conc.Naoh on Cl2? (3)
Chlorine reacts with cold dilute alkali to give chloride and hypochlorite while with hot concentrated alkali chlorides and chlorates are formed.
2.Give two equations to illustrate the chemical behaviour of phospine? (2)
Thermal stability: Phosphine decomposes into its elements when heated in absence of air at 317 K or when electric current is passed through it.
Combustion: When phosphine is heated with air or oxygen it burns to give meta phosphoric acid.
3.Structure of ammonia? (2)
- Ammonia molecule is pyramidal in shape
- N-H bond distance is 1.016 Å and
- H-H bond distance is 1.645 Å with a bond angle 107°.
- The structure of ammonia may be regarded as a tetrahedral with one lone pair of electrons in one tetrahedral position hence it has a pyramidal shape
4.Explain the action of heat on pcl5? (2)
1)OF2 (-1 always for flourine)
= -1
2)O2F2
= -1
3)Cl203
- 2x + 3(-2) = 0
- 2x -6 = 0
- 2x = 6
- x = 6/2
- = +3
2)I2O4
- 2x + 4(-2) = 0
- 2x – 8 = 0
- 2x = 8
- X = 8/2
- X = +4
12th Chemistry Chapter 3 p-Block Elements-II Important 5 Marks Questions
Welcome to our collection of 12th Chemistry Chapter 3 p-Block Elements-II Important 5 Marks Questions and Answers prepared from previous year public question papers and important repeated board exam questions. These long answer questions are highly useful for Tamil Nadu State Board Class 12 students preparing for public examinations, school tests, and revision exams.
The chapter p-Block Elements-II contains several important theory-oriented concepts related to halogens, phosphorus compounds, oxidation states, and molecular structures. Many direct and repeated 5 mark questions are frequently asked from this chapter in board examinations.
Most Repeated 5 Mark Questions
- Action of Dilute and Concentrated NaOH on Cl2
- Chemical Behaviour of Phosphine
- Oxidation States of Halogens
- Structure of Ammonia
Benefits of Practicing 5 Mark Questions
- Improves detailed answer writing skills
- Helps understand important concepts clearly
- Covers repeated public exam questions
- Enhances explanation and presentation skills
- Useful for public exam revision
Previous Year Public Exam Questions
The important 5 mark questions provided here are collected from previous year Tamil Nadu 12th Chemistry public question papers and important repeated board examination questions. These long answer questions are frequently asked in public exams and school assessments.
Students are advised to practice writing answers with proper chemical equations, structures, diagrams, and important points to score maximum marks in the examination.
More 12th Chemistry Study Materials
Explore more useful Class 12 Chemistry study resources:
- Important 1 Mark Questions
- 2 Marks and 3 Marks Questions
- Book Back Answers
- Chapter Wise Notes
- Most Expected Questions
- Public Exam Study Materials
- Previous Year Question Papers with Answers
Regular practice of important questions from p-Block Elements-II helps students improve confidence and score high marks in the 12th Chemistry public examination.
