Water that does not lather easily with soap is called: MCQ with Answer and Explanation

Explanation:
Faraday's second law: When the same quantity of electricity is passed through different electrolytes, the masses of substances deposited are proportional to their equivalent weights (E). m₁/m₂ = E₁/E₂. Equivalent weight = atomic mass / valency (or change in oxidation number). This law is used to calculate the amount of metal deposited or gas liberated. Electrolysis is quantitative.

Explanation:
Cathode is where reduction takes place (gain of electrons). In electrolytic cells, cathode is negative (connected to negative terminal of battery). Cations migrate to cathode and are reduced.

Explanation:
Group 18 elements are noble gases: helium, neon, argon, krypton, xenon, radon. They have completely filled valence shells, making them chemically inert (though xenon can form compounds). Nitrogen is Group 15, Oxygen Group 16, Hydrogen is unique (Group 1).