A solution turns methyl orange yellow. Its pH is: MCQ with Answer and Explanation

Explanation:
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K), the three primary macronutrients essential for plant growth. N promotes leaf growth, P aids root and flower development, K supports overall health. Fertilizer labels like 10-26-26 indicate the percentages of N, P₂O₅, and K₂O respectively. Calcium, magnesium, and sulfur are secondary nutrients, while Fe, Mn, Zn etc. are micronutrients.

Explanation:
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:
Alumina has a very high melting point (~2050°C). Cryolite (and fluorspar) is mixed to form a molten mixture with lower melting point (~950°C) and better electrical conductivity, enabling electrolytic reduction. The electrolyte is a solution of alumina in molten cryolite. Carbon anodes are consumed. This reduces energy consumption.