Ammonia gas is manufactured by the Haber process. The catalyst employed is:
A. Pt
B. Ni
C. Fe
D. V₂O₅
Answer: Option C
Solution (By JKExamLibrary)
Haber process: N₂ + 3H₂ ⇌ 2NH₃, conditions: 400-450°C, 200 atm, finely divided iron with promoters (K₂O, Al₂O₃). Pt is used in Ostwald process for HNO₃; V₂O₅ in Contact process for H₂SO₄.
Explanation:
Fractional distillation is specifically designed to separate miscible liquids whose boiling points differ by less than 25 K. It uses a fractionating column which provides surfaces for repeated evaporation and condensation, enriching the vapor with the more volatile component before it reaches the condenser.
Explanation:
Using Boyle's law: P₁V₁ = P₂V₂ => 2 atm × 5 L = 1 atm × V₂ => V₂ = 10 L. As pressure decreases, volume increases. The same mass of gas expands. This is a direct application of inverse proportionality. If temperature and amount of gas are constant, doubling pressure halves volume, etc.
Explanation:
Henry Moseley established that the properties of elements are periodic functions of their atomic numbers, not atomic masses. This refined Mendeleev's table and resolved anomalies like Ar-K. The modern periodic table is thus based on Moseley's work. Mendeleev proposed the original table based on atomic masses. Newlands gave Law of Octaves. Meyer plotted atomic volume curve.
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