12th HSC Group 16 17 18 elements questions
.png "12th HSC Elements of Group-16,-17-and-18-Previous-Year-Questions")
Are you preparing for your 12th HSC Chemistry exam? If yes, then focusing on Group 16 (Oxygen family), Group 17 (Halogens), and Group 18 (Noble gases) is a must. These topics hold significant weightage in the board exams, and solving previous year questions (PYQs) will give you a clear idea about the type of questions asked, important concepts, and exam trends.
In this blog, we bring you a compiled set of previous year questions on Group 16, 17, and 18 elements to help you strengthen your preparation.
📌 Why Focus on Group 16, 17, and 18?
- Frequently asked in board exams and competitive exams (MHT-CET, NEET, JEE).
- Covers conceptual, theoretical, and application-based questions.
- Questions test your knowledge of periodic trends, chemical properties, reactions, and compounds.
📝 Previous Year Questions: Group 16 (Oxygen Family)
Write the structure of ozone and explain its resonance.
Give reasons:
Ozone acts as a strong oxidizing agent.
H₂O₂ is a better oxidizing agent than O₂.
Explain the anomalous behavior of oxygen compared to other elements of Group 16.
Compare the acidic strength of H₂O, H₂S, H₂Se, H₂Te, and H₂Po.
Write any two uses of sulphur dioxide.
Explain the anomalous behavior of oxygen compared to other elements of Group 16.
Compare the acidic strength of H₂O, H₂S, H₂Se, H₂Te, and H₂Po.
Write any two uses of sulphur dioxide.
📝 Previous Year Questions: Group 17 (Halogens)
- Why is fluorine the most reactive element among halogens?
- Explain the trend in oxidizing power of halogens down the group.
- Write chemical reactions to show the bleaching action of chlorine.
- Compare the stability of interhalogen compounds with examples.
- Why is the bond dissociation enthalpy of F₂ lower than that of Cl₂?
📝 Previous Year Questions: Group 18 (Noble Gases)
- Why do noble gases show very low reactivity?
- Write a short note on clathrate compounds of noble gases.
- Give the preparation and properties of xenon fluorides.
- Explain the hybridization and structure of XeF₂, XeF₄, and XeF₆.
- Why is the electron gain enthalpy of noble gases almost zero?
📚 Tips to Prepare Effectively
- Go through NCERT and HSC textbooks for clear concepts.
- Revise periodic trends (electronegativity, ionization enthalpy, electron gain enthalpy).
- Practice structural and reasoning questions regularly.
- Solve last 5–10 years’ board papers for better understanding of important topics.
Group 16 Questions
- Write the chemical composition of cryolite.
- Explain the trends in the following properties with reference to Group 16:
- i. Atomic and ionic radii
- ii. Ionisation enthalpy
- iii. Electronegativity
- Explain the trends in the following atomic properties of Group 16 elements:
- i. Atomic radii
- ii. Ionisation enthalpy
- iii. Electronegativity
- iv. Electron gain enthalpy
- Give reason: Group 16 elements have lower ionisation enthalpy compared to Group 15 elements.
- Describe the anomalous behaviour of oxygen as compared with other elements of Group 16 with reference to:
- i. Magnetic property
- ii. Oxidation state
- iii. Hydrides
- Write the molecular and structural formula of Thiosulphuric acid.
- Write the structure and molecular formula for Sulphurous acid.
- Draw the structure of Sulphurous acid.
- Draw the structure of the following compounds:
- i. Chloric acid
- ii. Peroxydisulphuric acid
- Write resonating structures of ozone.
- What is the action of dioxygen on calcium?
- What are neutral oxides?
- Write a balanced chemical equation for the action of ozone on hydrogen peroxide.
- What are oxides? Write different types of oxides with one example each.
- The layer of ozone acts as a protective umbrella. Explain.
- How is oxygen prepared from PbO2?
- Give reason: Bleaching action of ozone is also called dry bleach.
- Write two uses of dioxygen.
- Explain the structure of sulphur dioxide.
- What happens when dilute H2SO4 is treated with CaF2?
- Write any two uses of H2SO4.
- What is the action of concentrated H2SO4 on copper?
- What happens when Cu is heated with concentrated H2SO4?
- Write the chemical equation for the preparation of sulphur dioxide from sulphur. Write uses of sulphur.
- What happens when sulphur dioxide is oxidised in the presence of V2O5?
Group 17 Questions
- Write the names and electronic configuration of the first two elements of Group 17.
- Describe the anomalous behaviour of fluorine compared with other elements of Group 17 with reference to:
- i. Hydrogen bonding
- ii. Oxidation state
- Write any four points of difference between fluorine and other halogens.
- What is the action of chlorine (Cl2) on the following:
- i. Cold and dilute caustic soda
- ii. Hot and concentrated caustic soda
- Write any two uses of chlorine.
- What is the action of chlorine on excess NH3?
- What is the action of chlorine on the following:
- i. NH3 (excess)
- ii. Phosphorus
- Draw structures of:
- i. Chlorine trifluoride (ClF3)
- ii. Chlorine pentafluoride (ClF5)
- What are interhalogen compounds? Explain with examples.
- What happens when ethene reacts with iodine monochloride?
Group 18 Questions
- Write two uses of Helium.
- Write two uses of Neon.
Conclusion
These previous year questions on Group 16, 17, and 18 elements are highly important for 12th HSC Chemistry exams. Students are advised to practice them thoroughly for scoring high marks in boards and competitive exams.
Post a Comment