Chemical KineticsInstantaneous and Average Rate831Choose the best answerWhich statement is false?AFor a typical reaction whose rate decreases with time, the initial instantaneous rate is high.BThe activated complex has a very short lifetime.CA tangent to a concentration–time curve gives the average rate.DOnly a fraction of molecular collisions are effective. Like 0 Discuss 0Share
Chemical BondingMolecular Geometry and Polarity832Choose the best answerH₂S has a net dipole moment whereas BeF₂ has zero dipole moment because:AH₂S is linear and BeF₂ is bentBH₂S is bent while BeF₂ is linearCSulfur is more electronegative than fluorineDBe is more electronegative than sulfur Like 0 Discuss 0Share
Sindh MDCAT 2021 Chemistry#Passivation of Aluminium#S- and P-Block Elements833Choose the best answerAluminium does not react with:AH₂SO₄BH₃PO₄CHNO₃DHCl Like 0 Discuss 0Share
LiquidsLondon Dispersion Forces834Choose the best answerThe force of attraction between helium atoms is mainly:AHydrogen bondingBCovalent bondingCDipole–dipole attractionDLondon dispersion force Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Protons835Choose the best answerHow many protons are present in 1 mol H₂?A6.02 × 10²³B1.20 × 10²⁴C12.04 × 10²²D6.02 × 10²⁴ Like 0 Discuss 0Share