Sodium hydroxide (caustic soda) is manufactured by: MCQ with Answer and Explanation

Explanation:
Graphite conducts electricity due to delocalized electrons in its structure and is chemically inert, allowing its use in electrodes for electrolysis and batteries. Diamond is an insulator. Hardness is not the reason; graphite is soft. It is opaque and black. Graphite electrodes are used in arc furnaces.

Explanation:
In electroplating, the object to be electroplated is connected as the cathode, where metal cations in the electrolyte are reduced to metal atoms and deposited as a coating. The anode is usually the plating metal, which oxidizes and dissolves, replenishing the electrolyte. For example, silver plating: cathode is the article, anode is pure silver, electrolyte is AgCN/AgNO₃.

Explanation:
Organic fertilizers (compost, manure, bone meal) add humus, improving soil structure, water retention, and aeration. They support beneficial microorganisms that slowly decompose organic matter, releasing nutrients gradually. Unlike synthetic fertilizers, they do not cause sudden nutrient spikes or soil acidification. Biofertilizers like Rhizobium fix nitrogen. Organic farming emphasizes sustainability and reduced chemical inputs.