Atomic StructureHund's Rule and Unpaired Electrons706Choose the best answerAccording to Hund's rule, how many unpaired electrons are present in the ground-state phosphorus atom, Z = 15?A1B2C3D5 Like 0 Discuss 0Share
Alkyl HalidesSN2 Reaction707Choose the best answerWhich statements are correct for an SN₂ reaction? (1) Rate depends on nucleophile concentration. (2) The nucleophile attacks from the side opposite the leaving group. (3) Bond formation and bond cleavage occur simultaneously.A(1) and (2) onlyB(1) and (3) onlyC(1), (2) and (3)D(2) and (3) only Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Atoms708Choose the best answerWhat is the total number of atoms present in 6 g H₂O?ANAB2NAC3NAD(1/3)NA Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model709Choose the best answerThe relation r = a₀n²/Z applies to:AMulti-electron atoms onlyBHydrogen and hydrogen-like speciesCCovalent molecules onlyDRadioactive elements only Like 0 Discuss 0Share
Atomic StructureEnergy of Electron in Bohr Orbit710Choose the best answerIn a Bohr orbit, the magnitude of the kinetic energy of an electron is:AHalf the magnitude of its potential energyBTwice the magnitude of its potential energyCOne-fourth the magnitude of its potential energyDEqual to zero Like 0 Discuss 0Share