Galvanization is the process of coating iron with:
A. Zinc
B. Tin
C. Copper
D. Chromium
Answer: Option A
Solution (By JKSSB Mock Tests)
Galvanization is coating iron or steel with a thin layer of zinc to prevent rusting. Zinc acts as a sacrificial anode—it corrodes preferentially (being more reactive) even if the coating is scratched, protecting the underlying iron. Tin coating (tin plating) protects only if the layer is intact. Chromium plating provides a shiny surface and corrosion resistance but works differently. Galvanized iron is used for roofing sheets, buckets, etc.
Explanation:
Washing soda (sodium carbonate, Na₂CO₃) is used to remove permanent hardness of water. It reacts with soluble calcium and magnesium chlorides/sulfates to form insoluble carbonates, which can be filtered out. Baking soda, bleaching powder, and plaster of Paris do not have this water-softening capability.
Explanation:
James Chadwick discovered the neutron in 1932. He bombarded beryllium with alpha particles and observed a highly penetrating, neutral radiation, which he identified as neutrons. This discovery explained isotopes and completed the basic picture of the atom's subatomic particles.
Explanation:
H₂O₂ decomposes when exposed to light (photochemical decomposition): 2H₂O₂ → 2H₂O + O₂. Light provides energy to break the O–O bond. To prevent decomposition, it is stored in amber or opaque bottles, often with stabilizers like urea or phosphoric acid. Also, traces of heavy metal ions catalyze decomposition. H₂O₂ is a strong oxidizing agent and bleaching agent.
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