The enzyme that hydrolyzes urea into ammonia and CO₂ is: MCQ with Answer and Explanation

Explanation:
Copper is below hydrogen in the reactivity series, so it cannot displace hydrogen from dilute acids (non-oxidizing acids like HCl or H₂SO₄). Magnesium, zinc, and iron are above hydrogen and react to produce H₂ gas. However, copper reacts with oxidizing acids like HNO₃ and hot conc. H₂SO₄, but not to produce H₂—they produce NO₂/SO₂.

Explanation:
Electronegativity is the tendency of an atom to attract shared electrons in a chemical bond. It increases across a period and decreases down a group. Fluorine, located at the top right of the periodic table (Group 17, Period 2), has the smallest atomic radius and highest effective nuclear charge, giving it the highest electronegativity (3.98 on Pauling scale).

Explanation:
Electron affinity is the energy change when an electron is added to a neutral gaseous atom. It represents the tendency to gain electrons. Ionization energy is the energy to remove an electron. Electropositivity and metallic character relate to the tendency to lose electrons and form positive ions.