Which fertilizer provides both nitrogen and phosphorus? MCQ with Answer and Explanation

Explanation:
C₂H₅OH + CH₃COOH ⇌ CH₃COOC₂H₅ + H₂O (esterification). Conc. H₂SO₄ acts as catalyst and dehydrating agent. Ethyl ethanoate is an ester with fruity smell.

Explanation:
Fluorine is the most electronegative element with a Pauling electronegativity of 3.98. Electronegativity increases across a period and decreases down a group. Thus, among the halogens, F > Cl > Br > I. Oxygen (3.44) is second. Electronegativity determines bond polarity. Because of its small size and high effective nuclear charge, fluorine strongly attracts bonding electrons. Noble gases are not assigned electronegativity values (except Kr, Xe).

Explanation:
Metals are malleable (can be beaten into sheets), ductile (drawn into wires), and good conductors. Brittleness is a characteristic of non-metals and some metalloids; metals can deform without breaking. For example, gold is highly malleable.