The corrosion of iron can be prevented by coating it with a layer of zinc. This process is called:
A. Electroplating with silver
B. Galvanization
C. Tinning
D. Anodizing
Answer: Option B
Solution (By JKExamLibrary)
Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting. Zinc acts as sacrificial anode. Tinning is coating with tin (tin cans). Anodizing is an electrochemical process for aluminum to form protective oxide. Electroplating can be with any metal. Galvanized iron is used for roofing sheets, water pipes.
Explanation:
Elements in the same vertical column (group) have the same number of electrons in their outermost shell (valence electrons). This gives them similar chemical properties. The number of shells increases as we go down a group, leading to trends in atomic radius and ionization energy.
Explanation:
Normal rainwater is slightly acidic (pH ~5.6) due to the dissolution of atmospheric CO2 forming carbonic acid. Acid rain is defined as precipitation with a pH lower than 5.6. It is caused by emissions of sulfur dioxide and nitrogen oxides, which react with water to form stronger sulfuric and nitric acids.
Explanation:
Single superphosphate (SSP) is a phosphorus fertilizer, a mixture of monocalcium phosphate and gypsum, produced by treating rock phosphate with sulfuric acid: Ca₃(PO₄)₂ + 2H₂SO₄ → Ca(H₂PO₄)₂ + 2CaSO₄. Urea and ammonium nitrate are nitrogenous fertilizers. Potassium chloride is a potash fertilizer. Phosphorus promotes root development and flowering.
No comments yet. Be the first to start the discussion!