Basic Concepts of ChemistryPhysical and Chemical Changes1081Choose the best answerLiquid → Solid is called:AMeltingBBoilingCFreezingDDeposition Like 0 Discuss 0Share
LiquidsHydrogen Bonding in Biomolecules1082Choose the best answerThe two strands of a DNA double helix are held together mainly by:AHydrogen bondingBIonic bondingCMetallic bondingDCovalent bonds between the two strands Like 0 Discuss 0Share
Alcohols and PhenolsNucleophilic Substitution of Primary Alcohols1083Choose the best answerWhich alcohol generally reacts with HX through an SN₂ mechanism?Atert-ButanolBtert-Amyl alcoholCEthanolDtert-Pentanol Like 0 Discuss 0Share
Alcohols and PhenolsLucas Test1084Choose the best answerThe order of reactivity toward Lucas reagent is:A1° > 2° > 3°B3° > 2° > 1°C2° > 1° > 3°D1° = 2° = 3° Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Gases#Ideal Gas Equation1085Choose the best answerValue of R gas constant in J·mol⁻¹·K⁻¹ is:A8.314B62.4C0.821D62400 Like 0 Discuss 0Share