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.
Explanation:
Pencil 'lead' is a mixture of graphite and clay. Graphite's layered structure allows it to leave marks on paper. Diamond is too hard and would tear paper. Fullerene is a nanomaterial, not for writing. Charcoal is used for drawing but not pencils.
Explanation:
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). These are the three primary macronutrients essential for plant growth. N promotes leafy growth, P aids root and flower development, and K improves overall health and disease resistance in crops.
Explanation:
The acidic behavior of HCl is due to the presence of H⁺ (or H₃O⁺) ions, which are generated only when it dissolves in water. Without moisture, HCl doesn't dissociate to produce H⁺, so it doesn't change the color of dry litmus. Both statements are correct and R explains A.
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