Skip to content Home Questions Play Progress Daily Challenge Questions › Chemistry Questions QUESTION Which listed unit is commonly used to report water hardness as a calcium-carbonate-equivalent concentration? Open question → QUESTION Assertion (A): Methane is not a major component of biogas. Reason (R): Biogas is produced by anaerobic microbial decomposition of organic matter. Open question → QUESTION Which of the following is NOT a food preservative? Open question → QUESTION Which compound is a building block of polycarbonate, a hard clear plastic used in some beverage bottles and household products? Open question → QUESTION Identify the sulfur-containing chemical compound that is primarily responsible for the intense aroma and sharp, biting flavor characteristic of crushed garlic cloves. Open question → QUESTION In water treatment, which listed function is performed by chlorine? Open question → QUESTION Bleaching powder is commonly used for which of the following purposes? Open question → QUESTION Which listed vehicle fuel is natural gas, mainly methane, stored at high pressure? Open question → QUESTION Which simplified sequence represents ozone formation from oxygen in the stratosphere? Open question → QUESTION What provides the initial heat when a conventional safety match is rubbed on its designated striking surface? Open question → QUESTION Why is fibreglass commonly used instead of metal for making high jump bars? Open question → QUESTION Which listed laboratory screening result supports suspected metanil-yellow adulteration in turmeric? Open question → QUESTION Which listed simple method can indicate chalk-powder contamination in wheat flour? Open question → QUESTION What is the ratio by mass of carbon and oxygen in carbon dioxide? Open question → QUESTION Whose early experimental research on surface tension and contaminated liquid surfaces helped lay the foundations of surface chemistry? Open question → QUESTION Using H=1, S=32 and O=16, which listed option is closest to the percentage composition by mass of H₂SO₃? Open question → QUESTION In the usual textbook classification, which listed group consists entirely of homogeneous mixtures? Open question → QUESTION ________ Law of independent migration of ions states that limiting molar conductivity of an electrolyte can be represented as the sum of the individual… Open question → QUESTION In classifying colloids into types such as sols, gels and foams, which basis is used? Open question → QUESTION The amount of solute present in a given quantity of solution is referred to as what? Open question → QUESTION Which of the following colloidal systems has liquid as the dispersed phase and solid as the dispersion medium? Open question → QUESTION Which listed mixture is homogeneous when the salt is fully dissolved below its solubility limit? Open question → QUESTION Which of the following serves as an illustration of a solid foam type of colloid (gas dispersed in a solid)? Open question → QUESTION An early match-head mixture described in NCERT’s account of match development contained which of the following substances? I. Antimony trisulphide II. Potassium chlorate III.… Open question → Home Questions Play Progress 