The main greenhouse gas emitted from agricultural activities (livestock and rice paddies) is: MCQ with Answer and Explanation

Explanation:
Diamond has a three-dimensional network of strong covalent bonds between carbon atoms (sp³ hybridization). This giant covalent structure gives diamond its extreme hardness, high melting point, and electrical insulating property. Graphite also has covalent bonds within layers but conducts due to delocalized electrons. Ionic bonds are in NaCl, metallic bonds in metals, hydrogen bonds in water.

Explanation:
Chlorination is a disinfection process. Chlorine reacts with water to form hypochlorous acid, which kills bacteria and viruses. It also provides residual protection in distribution pipes. Filtration removes particles; chlorine does not remove dissolved minerals or improve taste significantly; it can cause taste issues if excess.

Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).