Crude petroleum is heated and the vapors are passed through a fractionating column where they condense at different levels according to boiling points. Fractions: petrol (40-120°C), kerosene (150-250°C), diesel (250-350°C), lubricating oil, etc. This is a continuous process. The column has trays and maintains temperature gradient. Simple distillation cannot separate close boiling mixtures.
Explanation:
Ammonium chloride (NH₄Cl) consists of NH₄⁺ and Cl⁻ ions. Ionic bond between NH₄⁺ and Cl⁻. Within NH₄⁺, N-H are covalent bonds, with one coordinate bond formed by donation of N's lone pair to H⁺. So all three bond types are present. NaCl purely ionic. CO₂ purely covalent. CH₄ purely covalent.
Explanation:
A promoter is a substance that, when added in small quantities, enhances the activity or efficiency of a catalyst. For example, in the Haber process, molybdenum acts as a promoter for the iron catalyst. An inhibitor or poison decreases catalyst activity by blocking active sites.
Explanation:
Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to pressure: PV = constant. So P ∝ 1/V. Charles' law relates V and T at constant P. Gay-Lussac's law relates P and T at constant V. Boyle's law is used in syringes and scuba diving. Graph of P vs V is a hyperbola; P vs 1/V is a straight line.
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