Carbon

Carbon is a non-metallic element with symbol C and atomic number 6.
It is the basis of life, found in all organic compounds, fuels, and materials like coal, graphite, and diamonds.
In Bihar, carbon is relevant through coal-based industries, biomass use, and agricultural soil content.

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Key Properties of Carbon

• Symbol: C, Atomic Number: 6
• Tetravalent → forms 4 covalent bonds
• Found in: organic matter, fossil fuels, atmosphere (as CO₂)
• Can form millions of compounds – basis of organic chemistry
• Exists in crystalline and amorphous forms

📝 PYQ (BPSC): Carbon forms how many bonds? → 4 (Tetravalency)

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Allotropes of Carbon

🔷 Crystalline Allotropes

• Diamond: Hardest natural substance, bad conductor, used in cutting tools
• Graphite: Soft, good conductor, used in pencils, electrodes
• Fullerene: Molecules shaped like spheres (C60), used in nanotech

🔶 Amorphous Forms

• Coal, Charcoal, Lampblack, Coke
• Used as fuel, pigments, and industrial reducers

📝 PYQ: Which is the hardest substance in nature? → Diamond
📝 Expected MCQ: Which form of carbon conducts electricity? → Graphite

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Important Carbon Compounds

📝 Expected MCQ: Gas formed during incomplete burning? → CO
📝 Expected MCQ: Major gas in biogas? → CH₄

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Bihar-Specific Relevance of Carbon

⛏️ Coal-Based Economy

• Bihar uses coal for power generation in Kahalgaon and Barauni thermal plants
• Coal = form of amorphous carbon

🌾 Agriculture

• Organic carbon in soil is crucial for crop fertility
• Use of biochar, compost improves carbon content in Bihar’s Gangetic plains

🔋 Biogas Projects

• Methane (CH₄) from biogas units in rural Bihar supports cooking and power
• Carbon plays key role in this renewable fuel cycle

🏭 Industrial Uses

• Graphite electrodes used in foundries (Muzaffarpur, Patna units)

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Environmental Role of Carbon

• Carbon cycle maintains life balance – movement of carbon through atmosphere, soil, plants, animals
• Greenhouse gas: CO₂ traps heat → global warming
• Carbon footprint: Total CO₂ emitted by human activities

📝 Expected MCQ: Which gas contributes to global warming? → Carbon dioxide
📝 Expected MCQ: What is carbon footprint? → Total CO₂ released by activities

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Important Carbon-Based Processes

• Combustion: Carbon fuels release energy
• Photosynthesis: Plants absorb CO₂ and convert it into food
• Respiration: Organisms release CO₂
• Decomposition: Carbon returns to soil

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PYQs + Expected MCQs

📝 PYQ (BPSC): Which allotrope of carbon is soft and a good conductor? → Graphite
📝 PYQ: Which gas is released during incomplete combustion? → Carbon monoxide
📝 Expected MCQ: How many covalent bonds can carbon form? → 4
📝 Expected MCQ: Which form of carbon is used in pencils? → Graphite
📝 Expected MCQ: Which carbon-based fuel is used in rural Bihar? → Methane (biogas)
📝 Expected MCQ: What is the main cause of global warming? → CO₂

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Quick Revision Points

• Carbon is non-metal, tetravalent, atomic number 6
• Allotropes: Diamond, Graphite, Fullerene, Coal, Charcoal
• Forms important compounds: CO₂, CO, CH₄, Glucose
• Carbon cycle: photosynthesis, respiration, decomposition
• Bihar: coal plants, biogas, soil carbon, graphite use
• Carbon → base of organic chemistry and energy production

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Sources Used

• NCERT Science Class 10 – Carbon and Its Compounds
• Lucent GK – Chemistry Section
• Drishti Quick Book – Chemistry
• EduTeria + Ghatna Chakra PYQs (BPSC, DPRO, CDPO)
• BREDA Bihar Biogas Projects Report
• BSPCB – Environment & Air Quality Reports
• Bihar Agricultural University Soil Reports
• NITI Aayog – Carbon & Energy Transition India Policy