Plaster of Paris has the chemical formula: MCQ with Answer and Explanation

Explanation:
The stratospheric ozone layer absorbs the majority of the sun's harmful ultraviolet (UV-B and UV-C) radiation, preventing it from reaching Earth's surface. UV can cause skin cancer, cataracts, and damage to ecosystems. Ozone depletion is caused by CFCs (chlorofluorocarbons). Infrared is associated with heat, visible light is mostly harmless, radio waves are not absorbed by ozone.

Explanation:
Urea (NH₂CONH₂) has molar mass 60, with 28 g N, percentage = (28/60)×100 ≈ 46.6%. Rounded to 46%. It is the most concentrated solid nitrogen fertilizer. Ammonium nitrate is 33%, ammonium sulfate 21%.

Explanation:
DAP stands for Diammonium Phosphate, with the chemical formula (NH₄)₂HPO₄. It is a widely used phosphorus fertilizer that also supplies nitrogen. It is highly soluble and quickly releases nutrients into the soil, making it popular for starter fertilizers in agriculture.