Soap is prepared by heating fat with: MCQ with Answer and Explanation

Explanation:
Lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions. According to Coulomb's law, it is directly proportional to the product of the ionic charges and inversely proportional to the sum of their radii. Thus, higher charges and smaller sizes both increase lattice energy.

Explanation:
Across a period, the atomic radius decreases. This is because the number of protons (nuclear charge) increases, pulling the electrons in the same shell closer to the nucleus, while the number of shells remains constant. This increases the effective nuclear charge experienced by the valence electrons.

Explanation:
Stainless steel is an alloy of iron with chromium (minimum 10.5%), often nickel, and sometimes molybdenum. Chromium forms a passive oxide layer (Cr₂O₃) that prevents rusting. Brass is Cu + Zn. Bronze is Cu + Sn. Solder is Pb + Sn. Stainless steel is used in kitchen utensils, surgical instruments, and architecture. The most common type is 304 stainless (18% Cr, 8% Ni).