StoichiometryGas Volume Stoichiometry2041Choose the best answerHow many litres of CO₂ are produced when 10 L CO burns completely in O₂ at the same temperature and pressure? 2CO + O₂ → 2CO₂A20 LB10 LC5 LD2.5 L Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes2042Choose the best answerBurning a matchstick is an example of a:APhysical changeBChemical changeCChange in pressureDChange in colour only Like 0 Discuss 0Share
Aldehydes and KetonesClemmensen and Wolff–Kishner Reduction2043Choose the best answerAcetophenone undergoes Clemmensen or Wolff–Kishner reduction to give:AEthylbenzeneBTolueneCStyreneDBenzyl alcohol Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Molecules2044Choose the best answerA patient takes two spoons of glucose, C₆H₁₂O₆. Each spoon contains 4.5 g glucose. How many glucose molecules are taken?A6.02 × 10²²B3.01 × 10²²C1.505 × 10²²D3.01 × 10²³ Like 0 Discuss 0Share
SolidsLattice Energy2045Choose the best answerIf lattice energy is defined as lattice dissociation enthalpy, a positive lattice-energy value represents:AEnergy released when the lattice formsBEnergy required to separate the ionic crystal into gaseous ionsCEnergy needed to melt the solid onlyDZero energy change Like 0 Discuss 0Share