36 public questions tagged with this topic.
x = 0.8, pA = 1.2. k ≈ 0.00675 s⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Temperature Dependence - Arrhenius Equation and Activation Energy
t½ = [R]₀/(2k) = 0.16/(2×4.0×10⁻³) = 20 min.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Order and Molecularity and Units of Rate Constant
t = [R]₀/k = 0.08/(4.0×10⁻⁴) = 200 s.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - Zero Order Reactions
t = 0.05/(2.0×10⁻³) = 25 s.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Collision Theory - Effective Collisions and Catalyst Effect
t = ([R]₀ − [R])/k = (0.18 − 0.12)/(6.0×10⁻³) = 10 min.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Collision Theory - Effective Collisions and Catalyst Effect
Sublimation would separate the sublimable solid effectively. Crystallization, requiring a solvent, is less suitable as it’s designed for soluble impurities, not thermal properties.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Purification Methods - Crystallization Distillation Chromatography
In 2Ag₂O → 4Ag + O₂, Ag (+1) is reduced to 0, and O (-2) is oxidized to 0.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
Group 2 nitrates decompose to basic oxides, NO₂, and O₂. Be(NO₃)2 decomposes most readily to BeO (basic) due to Be²⁺’s small size and high charge density, which weakens the nitrate lattice.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Reaction: 2KClO₃ → 2KCl + 3O₂. Moles of O₂ = 0.1 mol. 3 mol O₂ from 2 mol KClO₃; 0.1 mol needs ≈ 0.0667 mol. With 50% efficiency, KClO₃ = 0.0667 / 0.5 ≈ 0.1333 mol; mass ≈ 16.33 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Importance and Nature of Chemistry and Properties of Matter
High temperature and moisture enhance microbial activity, increasing the rate of decomposition.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Nutrient Cycling - Carbon Phosphorus and Ecological Succession
Decomposition is slower in dry environments because moisture is essential for microbial activity.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Decomposition - Process and Factors
Humification leads to the accumulation of humus, a dark-colored amorphous substance that is resistant to microbial degradation.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Decomposition - Process and Factors
