LiquidsVaporization1231Choose the best answerVaporization is always:AEndothermicBExothermicCNeither endothermic nor exothermicDA nuclear process Like 0 Discuss 0Share
SZABMU MDCAT 2025 Chemistry#Chemical Bonding#Sigma and Pi Bonds1232Choose the best answerHow many σ and π bonds are present in maleic anhydride? (SZABMU MDCAT 2025)A5 σ 3 πB6 σ 3 πC7 σ 2 πD9 σ 3 π Like 0 Discuss 0Share
StoichiometryMolar Volume and Number of Moles1233Choose the best answerWhich sample contains the greatest number of moles?A11.2 dm³ H₂ at STPB44.8 dm³ N₂ at STPC67.2 dm³ CO₂ at STPD22.4 dm³ O₂ at STP Like 0 Discuss 0Share
Periodic TableShielding Effect1234Choose the best answerAcross a period, shielding remains nearly constant because added electrons enter:ANew inner shellsBOrbitals much closer to the nucleusCThe same principal shellDCompletely filled d-orbitals Like 0 Discuss 0Share
StoichiometryPercentage Composition by Mass1235Choose the best answerAn oxide has formula M₂O₃ and contains 68.57% oxygen by mass. The atomic mass of M is approximately:A11B22C27D56 Like 0 Discuss 0Share