The element with the largest atomic radius in period 3 is: MCQ with Answer and Explanation

Explanation:
Biogas is produced by anaerobic digestion of organic matter and consists mainly of methane (50-70%) and carbon dioxide (30-40%), with traces of H₂S, NH₃. Methane is the combustible component. It is a renewable fuel. The waste slurry is used as manure.

Explanation:
All matter is composed of tiny particles (atoms, molecules, or ions). This is a fundamental concept. Matter may not always be visible (e.g., air). It can change states (solid, liquid, gas). Gases have mass; for example, a filled gas cylinder weighs more than an empty one. The particulate nature of matter explains diffusion, Brownian motion, etc.

Explanation:
Extensive properties depend on the amount of substance. Enthalpy (heat content) is extensive because it scales with the quantity. Temperature, density, and refractive index are intensive properties; they remain constant regardless of the sample size. For example, 1 kg of water has more enthalpy than 1 g of water at the same temperature.