Sulphuric acid is manufactured by: MCQ with Answer and Explanation

Explanation:
Galvanization coats iron with zinc. Zinc is more reactive, corrodes first (sacrificial protection). Tin coating protects only if intact. Chromium is used for plating, nickel for alloys, but galvanizing specifically uses zinc.

Explanation:
Tritium (³H) is a radioactive isotope with a half-life of ~12.3 years, decaying by beta emission to ³He. Protium (¹H) and deuterium (²H) are stable. Tritium is used in self-luminous paints, tracer studies, and nuclear fusion. It occurs naturally in very small amounts from cosmic rays but is mainly produced in nuclear reactors.

Explanation:
The modern periodic law, established by Henry Moseley, states that the properties of elements are periodic functions of their atomic numbers. Mendeleev’s original table was based on atomic mass, but the modern version uses atomic number which resolves anomalies like Ar (Z=18, mass 40) and K (Z=19, mass 39).