Skip to content Home Questions Play Progress Daily Challenge Questions › Chemistry Questions QUESTION Statement (S): Ammonia is widely used in agriculture as fertiliser. Reason (R): Ammonia is the systematic name for nitrogen trihydride (NH₃). Open question → QUESTION Which substance is used both for caustic peeling in fruit and vegetable canning and in food-preservation processes that inhibit microbial growth? Open question → QUESTION Consider the following statements: 1. Sodium bicarbonate is a white crystalline solid used in fire extinguishers. 2. Sodium bicarbonate can act as both an… Open question → QUESTION Which of the following is used to remove the green colour from glass? Open question → QUESTION Which listed compound is a principal irritant component of pepper spray? Open question → QUESTION Which listed substance is a weak electrolyte in dilute aqueous solution? Open question → QUESTION Topaz, Al₂SiO₄(F,OH)₂, belongs to which listed mineral class? Open question → QUESTION How many pollutants are included in India’s National Air Quality Index framework? Open question → QUESTION Using C = 12 and O = 16, approximately how much oxygen does carbon monoxide contain for each 1.00 g of carbon? Open question → QUESTION How many chloride ions are nearest neighbours of each sodium ion in the ordinary rock-salt crystal structure of NaCl? Open question → QUESTION Which type of isomerism involves interchange of ligands between the complex cation and complex anion of a coordination compound? Open question → QUESTION Which listed process causes browning and flavour development when sugars are heated? Open question → QUESTION Assertion (A): Appropriate vulcanisation improves rubber’s elastic recovery and durability. Reason (R): Sulphur forms cross-links between rubber polymer chains, improving mechanical properties. Open question → QUESTION Under ordinary room conditions, which listed metal has the greatest tabulated density? Open question → QUESTION NPK refers to which listed type of product? Open question → QUESTION In a galvanic cell during spontaneous discharge, which electrode is the site of oxidation and the negative terminal relative to the cathode? Open question → QUESTION Assertion (A): Ionic solids are formed by electrostatic attraction between cations and anions. Reason (R): Ionic solids generally have low melting points and conduct… Open question → QUESTION Four proposed bent O₃ Lewis diagrams each show a double bond between the left oxygen and central oxygen, and a single bond between the… Open question → QUESTION What is the general name for deterioration of fats and oils through oxidation or hydrolysis, producing unpleasant flavours and odours? Open question → QUESTION Consider the following statements about usual industrial and food-additive roles. 1. Potassium metabisulphite is used as a food preservative. 2. Monosodium glutamate is used… Open question → QUESTION Which listed value is closest to the total number of atoms in one mole of methanol, CH₃OH? Open question → QUESTION Which listed statement best describes a pure crystalline solid that melts without decomposing at a specified pressure? Open question → QUESTION Which phenomenon is opposite to solidification? Open question → QUESTION What is the molecular shape of the isolated hydronium ion, H₃O⁺, formed when water accepts a proton? Open question → Home Questions Play Progress 