A gas at 300 K occupies 2 L. If the temperature is raised to 600 K at constant pressure, the volume becomes: MCQ with Answer and Explanation

Explanation:
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:
Enzymes are proteins with complex three-dimensional structures maintained by hydrogen bonds, ionic bonds, and hydrophobic interactions. Extremes of pH or high temperature disrupt these bonds, causing denaturation (loss of structure and function). Each enzyme has an optimum pH and temperature. For example, pepsin works in acidic stomach, trypsin in alkaline intestine.

Explanation:
Boyle's law: P ∝ 1/V or PV = constant at constant T and n. So if volume increases, pressure decreases. This is because gas molecules have more space and hit the walls less frequently. An example is a syringe: pulling the plunger increases volume, decreases pressure.