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p-Block Elements - II

Tamil Nadu Board · Class 12 · Chemistry

Flashcards for p-Block Elements - II — Tamil Nadu Board Class 12 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.

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32 Flashcards
Card 1Group 15: Nitrogen Preparation

Write the balanced equation for the preparation of nitrogen gas from sodium azide decomposition at 575 K. Explain the reaction conditions.

Answer

2NaN₃(s) → 2Na(s) + 3N₂(g) at 575 K Explanation: Sodium azide undergoes thermal decomposition at 575 K (approximately 300°C) to produce nitrogen gas and sodium metal. This is a safe laboratory method…

Card 2Group 15: Ammonia Reactions

Ammonia reacts with bromine water under different conditions. Write the equations for both reactions and explain the products formed.

Answer

With excess ammonia: 8NH₃ + 3Br₂ → N₂ + 6NH₄Br (overall) With excess bromine: 2NH₃ + 6Br₂ → 2NCl₃ + 6HBr (nitrogen tribromine forms, which is highly explosive) Explanation: With excess ammonia, nitr…

Card 3Group 15: Stoichiometry and Gas Laws

Calculate the volume of ammonia gas (at STP) produced when 14g of metallic sodium reacts with 3.4g of phosphorus according to the equation: 3Mg + 2NH₃ → Mg₃N₂ + 3H₂. Given: Molar mass of Mg = 24, N =

Answer

Note: The question seems to have inconsistency. Let's solve for NH₃ decomposition reaction: 4NH₃ → N₂ + 3H₂ Given mass of NH₃ = 3.4g Molar mass of NH₃ = 14 + 3(1) = 17 g/mol Step 1: Calculate moles …

Card 4Group 15: Nitrogen Properties

Why is nitrogen gas chemically inert at room temperature despite its abundance in the atmosphere? Explain in terms of bond energy.

Answer

Nitrogen's inertness is due to: 1. HIGH BOND ENERGY: The N≡N triple bond has a very high bond dissociation energy of 946 kJ/mol (225 kcal/mol). This makes breaking the triple bond extremely difficult…

Card 5Group 15: Nitric Acid Manufacture

Write the industrial preparation of nitric acid by Ostwald's process. Include all equations and reaction conditions.

Answer

Ostwald's Process - Three Steps: Step 1: Oxidation of ammonia to NO 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g) [ΔH = -120 kJ] Conditions: 1275 K, platinum gauze catalyst, excess air (1:10 ratio) Step 2: Ox…

Card 6Group 15: Phosphorus Allotropes

Explain why white phosphorus is self-igniting (spontaneously combusts) in air at room temperature, while red phosphorus does not. What causes the phosphorescence of white phosphorus?

Answer

WHITE vs RED PHOSPHORUS: WHITE PHOSPHORUS: - Structure: P₄ molecules arranged in crystalline form with weak intermolecular forces - Reactivity: Extremely reactive due to strained P₄ tetrahedral struc…

Card 7Group 15: Phosphorus Compounds

Phosphorus trichloride undergoes hydrolysis with water. Write the step-wise mechanism and overall equation.

Answer

HYDROLYSIS OF PCl₃: Step 1: Coordination complex formation PCl₃ + H₂O → PCl₃·H₂O (Water coordinates using oxygen lone pair to vacant 3d orbital on P) Step 2: Elimination of HCl PCl₃·H₂O → P(OH)Cl₂ +…

Card 8Group 15: Chemical Bonding

Calculate the percentage of ionic character in the N-H bond in ammonia. Given: Electronegativity of N = 3.0, H = 2.1. Use the relationship: Ionic character (%) ≈ 0.16|ΔEN| + 0.035(ΔEN)² × 100

Answer

Step 1: Calculate electronegativity difference ΔEN = |EN(N) - EN(H)| = |3.0 - 2.1| = 0.9 Step 2: Apply ionic character formula Ionic character (%) = [0.16(0.9) + 0.035(0.9)²] × 100 = [0.144 + 0.035(0…

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Frequently Asked Questions

What are the important topics in p-Block Elements - II for Tamil Nadu Board Class 12 Chemistry?
Key topics in p-Block Elements - II include p-Block Elements II — Chapter Overview Mind Map, p-Block Elements Group Overview, Mind map showing the hierarchical organization of all four p-block groups and their major topics. These are the concepts Tamil Nadu Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in p-Block Elements - II — Tamil Nadu Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for p-Block Elements - II?
There are 32 flashcards for p-Block Elements - II covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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