Rhizobium is a nitrogen-fixing bacterium that lives in root nodules of legumes and converts atmospheric N₂ to ammonia, enriching soil fertility naturally. It is a biofertilizer. Urea and ammonium sulfate are synthetic nitrogenous fertilizers. Superphosphate is a synthetic phosphorus fertilizer. Biofertilizers like Azotobacter, Blue-green algae, and mycorrhizae are eco-friendly and sustainable.
Explanation:
Ernest Rutherford is generally credited with the discovery of the proton in 1919 through the nuclear reaction: ¹⁴N + α particle → ¹⁷O + proton. Eugen Goldstein earlier observed canal rays (positive rays) which were later identified as protons by Rutherford. Thomson discovered electron, Chadwick neutron. So Rutherford is the accepted discoverer.
Explanation:
Boron trifluoride (BF₃) has covalent bonds where boron shares three electrons with three fluorine atoms. Although BF₃ can accept a lone pair to form coordinate bonds (as in BF₄⁻), its own bonds are polar covalent. Ionic bonding occurs between metal and non-metal.
Explanation:
Petroleum originates from microscopic marine organisms (plankton) that sank to the seabed and were transformed by heat/pressure over millions of years. Coal is from land plants.
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