Chemistry of HydrocarbonsElectrophilic Aromatic Substitution221Choose the best answerNitration of benzene is classified as:AElectrophilic substitutionBElectrophilic additionCNucleophilic additionDNucleophilic substitution Like 1 Discuss 0Share
ElectrochemistryCalculation of Oxidation Number222Choose the best answerIn which compound does sulfur have its highest oxidation state?AS₈BSO₂CSO₂Cl₂DNa₂S₂O₃ Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isotopes223Choose the best answerAn element contains 75% of an isotope of mass 24 u and 25% of an isotope of mass 26 u. What is its relative atomic mass?A24.0B24.5C25.0D25.5 Like 0 Discuss 0Share
MDCAT Chemistry Paper 2025#Liquids#Vapour Pressure224Choose the best answerWhich of the following is least volatile? (IBA MDCAT 2025)AGlycerolBWaterCAcetic acidDDiethyl ether Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes225Choose the best answerWhich of the following is a characteristic of a chemical change?AFormation of one or more new substancesBNo energy change can occurCChemical composition remains unchangedDOnly the physical state changes Like 3 Discuss 0Share