The element with electronic configuration 2,8,6 belongs to: MCQ with Answer and Explanation

Explanation:
Calgon is the trade name for sodium hexametaphosphate (Na6P6O18). It is used to soften hard water because the hexametaphosphate ion binds (chelates) with calcium and magnesium ions in the water, forming a soluble complex. This prevents the metal ions from interfering with soap lathering.

Explanation:
NPK fertilizers supply the three primary macronutrients: Nitrogen (N), Phosphorus (P), and Potassium (K). Plants also require trace elements (micronutrients) in very small amounts for proper growth, such as Iron, Manganese, Zinc, Copper, Boron, and Molybdenum. Both statements are factually correct.

Explanation:
V ∝ T (in Kelvin). Using Celsius gives a linear relationship but not direct proportionality (line does not pass through origin). Absolute zero (0 K = -273.15°C) is the theoretical temperature of zero volume.