Consider the following statements: 1. NPK fertilizers contain only macronutrients. 2. Zinc and Boron are micronutrients for plants. Which is/are correct? MCQ with Answer and Explanation

Explanation:
Ammonium ion (NH₄⁺) contains a coordinate bond: NH₃ donates its lone pair of electrons to H⁺ to form a covalent bond where both electrons come from nitrogen. NaCl is ionic, NH₃ has ordinary covalent bonds, Cl₂ has a nonpolar covalent bond. In NH₄⁺, all four N–H bonds are equivalent after formation. Coordinate bond is also called dative bond and is common in complex ions like [Cu(NH₃)₄]²⁺.

Explanation:
Camphor sublimes—it directly changes from solid to vapor on heating without passing through the liquid phase. Other sublimable solids include naphthalene, iodine, ammonium chloride, and dry ice (solid CO₂). Sodium chloride, sugar, and sand melt or decompose on strong heating. Sublimation is used to separate sublimable substances from non-sublimable impurities. The process requires careful heating.

Explanation:
NH₄Cl is from strong acid (HCl) and weak base (NH₄OH). It hydrolyzes: NH₄⁺ + H₂O ⇌ NH₄OH + H⁺, making solution acidic (pH