Fluorine has the highest electronegativity value (3.98) on the Pauling scale. Electronegativity is the tendency of an atom to attract electrons in a chemical bond. As we go from fluorine down the halogen group, electronegativity decreases.

Coal is a non-renewable fossil fuel that takes millions of years to form. Solar, wind, and hydroelectric are renewable sources.

Insulin, produced by the pancreas, regulates blood glucose levels by promoting glucose uptake by cells.

Gravitational potential energy = mgh = 5 × 10 × 2 = 100 J

The pH scale ranges from 0 to 14, where 7 is neutral, below 7 is acidic, and above 7 is basic/alkaline.

Light and electrons exhibit wave-particle duality, meaning they behave as both waves and particles depending on the experiment.

Using the formula F = (9/5)C + 32, when C = F, we get C = (9/5)C + 32, solving gives C = -40°

Using Distance = Speed × Time: Distance = 3 × 10⁸ × 2 = 6 × 10⁸ meters.

Melting of ice is an endothermic process as it requires heat energy input to convert solid ice into liquid water. Other options are exothermic reactions that release heat.

The relationship between focal length (f) and radius of curvature (R) is: R = 2f. Therefore, R = 2 × 20 = 40 cm.