Sodium bicarbonate (NaHCO₃) is an acidic salt because it contains a replaceable hydrogen atom (can neutralize bases). Its aqueous solution is mildly basic due to hydrolysis, but chemically it is an acid salt (formed by partial replacement of H of carbonic acid). K₂SO₄ is normal salt, CaOCl₂ is mixed salt, Na₂CO₃ is normal salt. Acid salts can react with bases.
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CNG (Compressed Natural Gas) is primarily methane (CH₄). LPG is propane and butane. Methane is the lightest hydrocarbon. CNG is a cleaner fuel for vehicles.
Explanation:
Pepsin is a protease secreted in the stomach; it hydrolyzes proteins into peptides. Ptyalin (salivary amylase) digests starch; amylase also breaks starch; lipase digests fats.
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Cobalt-60 is a gamma-ray emitter used in radiotherapy to destroy cancerous cells. Iodine-131 is used for thyroid cancer and disorders. Carbon-14 is used in radiocarbon dating. Uranium-235 is used as fuel in nuclear reactors and weapons. Radioisotopes for medical use are produced in nuclear reactors. Gamma rays penetrate and damage DNA of rapidly dividing cells.
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