MCH-023 IGNOU Solved Assignment 2026-27
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Syllabus & Overview
MCH-023 Solved Assignment: Environmental Chemistry (TMA)
The Tutor Marked Assignment (TMA) for MCH-023 Environmental Chemistry is a 30% weightage component of the M.Sc. (Chemistry) curriculum, designed to evaluate conceptual understanding of key topics across four official blocks. Below are verified solutions aligned with the IGNOU eGyanKosh curriculum for the current academic session.
Key Syllabus Blocks Covered
- Block 1: Soil Chemistry
- Soil composition and classification (clay, silt, sand ratios).
- Nutrient cycling: Nitrogen, Phosphorus, and Potassium dynamics.
- Soil pH and its impact on microbial activity and plant growth.
- Heavy metal contamination: Sources, mobility, and remediation strategies (e.g., chelation, phytoremediation).
- Block 2: Water Chemistry
- Surface water vs. groundwater: Chemical differences and contamination risks.
- Hardness, alkalinity, and dissolved oxygen in water quality assessment.
- Removal of heavy metals (e.g., arsenic, lead) via coagulation, ion exchange, and membrane technologies.
- Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) analysis.
- Block 3: Atmospheric Chemistry
- Primary and secondary pollutants: NOx, SOx, VOCs, and particulate matter (PM2.5/PM10).
- Photochemical smog formation and ozone depletion mechanisms.
- Greenhouse gases (CO2, CH4, N2O) and their radiative forcing.
- Atmospheric deposition: Wet vs. dry deposition of acidic pollutants.
- Block 4: Pollutants in Soil and Water
- Pesticide residues: Persistence, bioaccumulation, and degradation pathways.
- Eutrophication: Nutrient loading (N/P) and algal bloom dynamics.
- Emerging contaminants (e.g., pharmaceuticals, microplastics) in aquatic systems.
- Bioremediation techniques: Microbial degradation of hydrocarbons and organochlorines.
Sample Solution Format (Word Limit Compliance)
Solutions follow a structured approach:
- 500-word questions: Detailed explanations with chemical reactions, diagrams (where applicable), and real-world case studies (e.g., Bhopal gas tragedy for atmospheric pollutants).
250-word questions
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