Which of the following is not a nitrogenous fertilizer? MCQ with Answer and Explanation

Explanation:
Modern periodic law: The physical and chemical properties of elements are periodic functions of their atomic numbers. This was established by Moseley. Mendeleev's periodic law was based on atomic masses. Atomic number (Z) determines electronic configuration, which determines chemical behavior. Mass numbers vary with isotopes.

Explanation:
Biogas is produced by anaerobic decomposition of organic matter (cow dung, agricultural waste) and typically contains 50-70% methane (CH₄), 30-40% CO₂, and traces of H₂S, NH₃, and H₂. Methane provides the fuel value. Biogas is a renewable fuel used for cooking and electricity generation. The slurry is good manure.

Explanation:
Silver bromide decomposes into silver and bromine on exposure to light. This is a photochemical decomposition reaction, where a single compound breaks down into two or more simpler substances. It is also a redox reaction (Ag⁺ reduced, Br⁻ oxidized). Photographic films use this property. Combination would be A + B → AB. Displacement is A + BC → AC + B. Neutralization is acid + base → salt + water.