The reaction N₂ + 3H₂ → 2NH₃ is an example of: MCQ with Answer and Explanation

Explanation:
Lead-acid batteries use dilute H₂SO₄ as electrolyte. The electrodes are Pb and PbO₂. During discharge, both plates form PbSO₄ and the acid concentration decreases. Recharging reverses the reaction.

Explanation:
During the electrolysis of water, reduction occurs at the cathode (negative electrode), where H⁺ ions gain electrons to form hydrogen gas (2H⁺ + 2e⁻ → H₂). Oxidation occurs at the anode, producing oxygen gas. The volume of H₂ collected is exactly twice that of O₂.

Explanation:
Extensive properties depend on the amount of substance. Number of moles (or mass, volume) is extensive. Density, refractive index, boiling point are intensive properties – they do not depend on the quantity. For example, 1 liter of water boils at 100°C, same as 10 liters. Intensive properties are useful for identifying substances.