Atomic StructureDegenerate Orbitals591Choose the best answerIn the absence of an external electric or magnetic field, which pair of orbitals is degenerate?A2s and 3sB3dxy and 3dxzC3s and 3pD3p and 4p Like 0 Discuss 0Share
S & P Block ElementsGroup 2 Reactions with Water592Choose the best answerWhich statement correctly describes the reactions of Group 2 metals with water?ABe reacts vigorously with cold water, whereas Mg does not.BBe is unreactive, Mg reacts mainly with steam, while Ca, Sr and Ba react more readily.CAll Group 2 metals react equally with cold water.DOnly Be and Mg liberate H₂ from water. Like 0 Discuss 0Share
Periodic TableIsoelectronic Species and Ionic Radius593Choose the best answerWhy is the ionic radius of S²⁻ larger than that of K⁺?AS²⁻ contains more electrons than K⁺.BK⁺ contains more occupied electron shells.CS²⁻ and K⁺ are isoelectronic, but S²⁻ has a lower nuclear charge.DS²⁻ has a higher nuclear charge than K⁺. Like 0 Discuss 0Share
Chemical BondingHybridization and Sigma Bond Strength594Choose the best answerWhich overlap generally produces the strongest σ bond among the following?Asp³–sp³Bsp–spCsp²–sp²DAll are equally strong Like 0 Discuss 0Share
SINDH MDCAT 2018 Chemistry#Amino Acids#Macromolecules595Choose the best answerZwitter ion is formed when proton goes from: (Sindh MDCAT 2018)AAmino to carboxyl groupBCarboxyl to amino groupCCarboxyl group onlyDAmino group only Like 0 Discuss 0Share