8 public questions tagged with this topic.
Tertiary amines like (CH₃CH₂)₃N do not react with HNO₂ to liberate N₂, unlike primary aliphatic amines, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Preparation - Hoffmann Bromamide and Reduction of Nitro Compounds
C₃H₉N has four isomers: propan-1-amine, propan-2-amine, ethylmethylamine, and trimethylamine. Only primary amines (propan-1-amine and propan-2-amine) react with HNO₂ to liberate N₂, so the number is 2.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Preparation - Hoffmann Bromamide and Reduction of Nitro Compounds
Ethylamine (CH₃CH₂NH₂) reacts with HNO₂ to produce ethanol (CH₃CH₂OH) and nitrogen gas, as per the PDF’s chemical properties.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Preparation - Hoffmann Bromamide and Reduction of Nitro Compounds
Tertiary amines like (CH₃CH₂)₃N do not react with HNO₂ to form N₂, unlike primary aliphatic amines, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Preparation - Hoffmann Bromamide and Reduction of Nitro Compounds
The Dumas method involves heating the compound to release nitrogen gas (N₂), which is collected and measured at STP.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Moles = 2.5/22.4 ≈ 0.1116 mol; molar mass = 5/0.1116 ≈ 44.8 g/mol. Assume NₓOᵧ: 14x + 16y = 44.8. Simplest ratio: N₂O (14×2 + 16 = 44); empirical formula = N₂O.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Mole Concept and Molar Masses and Percentage Composition
Reaction: N₂ + 3H₂ → 2NH₃. Moles of H₂ = 3 mol. 3 mol H₂ need 1 mol N₂; actual N₂ = 1 / 0.6 ≈ 1.67 mol. Volume = 1.67 × 22.4 ≈ 37.41 L.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Laws of Chemical Combination - Conservation Mass Definite Multiple
“Denitrification” for which process converts nitrate to nitrogen gas in the nitrogen cycle. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Ecosystem processes are constrained by energy conservation and by the cycling of matter. Energy enters mainly through primary production, is lost as metabolic heat at every transfer, and therefore cannot be recycled in the way that carbon, nitrogen, phosphorus, or water can. The remaining alternatives—“Nitrification”, “Ammonification”, “Fixation”—refer to different states, processes, or scales and therefore do not express the same causal relationship. The relevant inference should follow the pathway from resource supply to organismal uptake and then to ecosystem-level flux. Productivity, trophic transfer, decomposition, and nutrient regeneration are connected, but each measures a different part of that pathway. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18
