Skip to content Home Questions Play Progress Daily Challenge Questions › Chemistry Questions QUESTION Using electron affinity as the positive energy released when an electron is added to a neutral gaseous atom, which increasing order is correct for… Open question → QUESTION Which of the following statements is correct? Open question → QUESTION Which listed substance is NOT a product of the usual thermal decomposition of lead nitrate? Open question → QUESTION Which colourless, odourless gas, relatively unreactive at ordinary temperatures, was identified by Daniel Rutherford in 1772? Open question → QUESTION In July 2018, an experiment aboard the International Space Station cooled a cloud of atoms of which chemical element to one ten-millionth of one… Open question → QUESTION At 15 °C and approximately 1.013 bar, which listed gas has a density near 1.87 kg/m³, about 1.5 times that of air, and can… Open question → QUESTION Which listed pair of oxides typically accounts for the largest share of granite’s bulk chemical analysis? Open question → QUESTION When carbon dioxide gas is bubbled through freshly prepared lime water, what is the nature of the precipitate formed? Open question → QUESTION What is the usual name for the burning process in which a substance reacts with oxygen and releases heat? Open question → QUESTION At a given temperature and pressure, which option best describes the usual shape and volume of a liquid? Open question → QUESTION Why do tiny drops of water appear on the outside of a glass filled with chilled water? Open question → QUESTION In the usual paper-cup demonstration, why can the water-wetted part of the cup resist catching fire while liquid water remains in it? Open question → QUESTION In a conventional zinc–carbon dry cell, the outer container acting as the anode is made of which metal? Open question → QUESTION Assertion (A): When aqueous solutions of sodium sulphate and barium chloride are mixed, a white precipitate is formed. Reason (R): Barium sulphate is insoluble… Open question → QUESTION A galvanic or voltaic cell converts chemical energy into electrical energy through which listed arrangement of its redox reaction? Open question → QUESTION Once a catalytic surface is saturated, which reaction order with respect to additional reactant is typically observed at fixed temperature and available catalytic surface? Open question → QUESTION Heating lead nitrate produces brown fumes. Which gas causes this colour? Open question → QUESTION Consider the following statements: 1. A physical change is generally reversible and no new substance is formed. 2. A chemical change results in the… Open question → QUESTION For a single-reactant rate law, a rate directly proportional to the first power of the reactant concentration is called: Open question → QUESTION According to a common rough rule of thumb for many reactions near room temperature, a 10 °C rise makes the rate constant approximately ______. Open question → QUESTION The decomposition of gaseous Ammonia on a hot platinum surface is a _________ order reaction at high pressure. Open question → QUESTION When electricity is passed through water, what kind of chemical reaction occurs? Open question → QUESTION Match the decomposition reactions with the reaction-type labels. Reaction | Type A. Decomposition of H₂O |1. Redox reaction B. Decomposition of NaH |2. Redox… Open question → QUESTION Which listed product is formed in the ammonia–brine reaction NaCl + H₂O + CO₂ + NH₃ → NaHCO₃ + NH₄Cl? Open question → Home Questions Play Progress 