Atomic Structure STBAtomic Structure MCQs (STB)#Polonium and Radium#Radioactivity276Choose the best answerWhich two radioactive elements did Marie and Pierre Curie isolate from pitchblende?AUranium and thoriumBPolonium and radiumCLead and bismuthDRadium and uranium Like 0 Discuss 0Share
Atomic StructureHund's Rule277Choose the best answerWhich statement describes Hund's rule rather than Pauli's exclusion principle?AAn orbital can contain a maximum of two electronsBPaired electrons in one orbital have opposite spinsCDegenerate orbitals are singly occupied before pairingDNo two electrons have identical sets of four quantum numbers Like 0 Discuss 0Share
Sindh MDCAT 2022 Chemistry#Aldehydes and Ketones#Carbonyl Compounds278Choose the best answerQ.90 Aldehyde reacts with:AKetones are more easily oxidizedBIt is always difficult to oxidize aldehydeCMild oxidizing agent & strong oxidizing agent bothDOnly strong oxidizing agent Like 0 Discuss 0Share
ElectrochemistryOxidation and Reduction279Choose the best answerIn 10Cl⁻ + 16H⁺ + 2MnO₄⁻ → 5Cl₂ + 2Mn²⁺ + 8H₂O, which statement is correct?AMn is oxidized from +7 to +2BCl is reduced from 0 to −1CCl⁻ is reduced from −1 to 0DMn is reduced from +7 to +2 Like 0 Discuss 0Share
Chemical BondingIntramolecular Hydrogen Bonding280Choose the best answerWhich compound shows intramolecular hydrogen bonding?AHFBH₂OCp-NitrophenolDo-Nitrophenol Like 0 Discuss 0Share