StoichiometryMole–Mole Stoichiometry3011Choose the best answer27 g Al reacts with O₂ according to: 4Al + 3O₂ → 2Al₂O₃ How many moles of O₂ are required?A3 molB0.27 molC0.75 molD1.5 mol Like 1 Discuss 0Share
MDCAT Chemistry Paper 2025#Percentage Yield#Stoichiometry3012Choose the best answerWhat is the percentage yield when actual yield is 2 g and theoretical yield is 4 g? (IBA MDCAT 2025)A25%B50%C75%D85% Like 1 Discuss 0Share
SolidsRadius Ratio and Coordination Number3013Choose the best answerThe radius-ratio range for tetrahedral coordination is approximately:A0.732–1.000B0.414–0.732C0.225–0.414D0.155–0.225 Like 0 Discuss 0Share
MDCAT Chemistry Past Paper 2023#Enzymes#Macromolecules3014Choose the best answerEnzymes show optimum activity between 37°C to 50°C. However, they work: (MDCAT 2023)AAbove 50°CBBelow 37°CCThey lose activity permanently above 50°CDThey lose activity permanently below 37°C Like 0 Discuss 0Share
SolidsAllotropes of Sulfur3015Choose the best answerThe transition temperature of sulfur between rhombic and monoclinic forms is approximately:A100°CB95.5°CC0°CD25°C Like 0 Discuss 0Share