ElectrochemistryBalancing Redox Reactions by Ion-Electron Method1251Choose the best answerFor the reduction half-reaction MnO₄⁻ → Mn²⁺ in acidic medium, the number and position of electrons are:A5e⁻ on the rightB5e⁻ on the leftC3e⁻ on the rightD3e⁻ on the left Like 0 Discuss 0Share
GasesMolar Volume at STP1252Choose the best answerAt STP (273 K and 1 atm), one mole of an ideal gas occupies approximately:A11.2 dm³B22.4 dm³C44.8 dm³D1.0 dm³ Like 0 Discuss 0Share
Atomic StructureMasses of Subatomic Particles1253Choose the best answerThe approximate masses of one mole of protons and one mole of electrons are respectively:A6.022 × 10²³ g and 1 gB1.008 g and 0.55 mgC9.1 × 10⁻²⁸ kg and 1.008 gD2 g and 1 g Like 1 Discuss 0Share
Industrial ChemistryInduced-Fit Model1254Choose the best answerAccording to the induced-fit model, an enzyme:AHas a completely rigid active site.BChanges its shape slightly to improve substrate binding.CPermanently changes into the product.DBinds the substrate only after the reaction is complete. Like 0 Discuss 0Share
Carboxylic AcidsFischer Esterification1255Choose the best answerWhich condition is commonly used to convert a carboxylic acid into an ethyl ester?AEthanol without catalystBDry HCl in ethanolCLiAlH₄DAluminium ethoxide Like 0 Discuss 0Share