Chemistry

Q35. Which two elements are primarily added to soil by green manure? [RRB JE CBT 1 (20 February 2026, Shift 1)] (A) …

35. What happens to soap molecules when they are added to water? [RRB Group D (2025 recruitment cycle), Shift 3 — 25 …

Q50. A packet of potato chips is filled with nitrogen gas before sealing. What is the main reason for using nitrogen in …

The collection includes hydrocarbons, alcohols, polymers, organic acids, explosive substances, fuels, and related organic chemistry topics. 280. Unsaturated hydrocarbons usually produce: [RRB …

Non-metals: Carbon and its forms, Hydrogen and its compounds, Sulphur, Nitrogen, Halogens, Inert Gases, and Acids, Bases and Salts. 180. When hydrochloric …

Q35. Which of the following substances has the highest resistivity? [RRB Group D 2025-cycle Official Paper (21 August 2026, Shift 1)] (A) …

Q80. Which of the following is NOT one of the belts of iron ore deposits in India? [SSC Selection Post (Graduate Level), …

Q35. Which chemical weathering process occurs when atmospheric or soil carbon dioxide dissolves in water? [RRB NTPC Graduate Level CBT-II, 10 July …

50. Which of the following is NOT an example of a colloid? [RRB Group D, 25 Aug 2026, Shift 2] (A) Milk …

50. Which of the following phenomena is explained by Bohr’s model? [RRB Group D — 14 Aug 2026, Shift 1] (A) Rutherford …