Industrial ChemistryNatural Adhesives916Choose the best answerWhich of the following is a natural adhesive?AEpoxy resinBCyanoacrylateCCaseinDSilicone resin Like 0 Discuss 0Share
StoichiometryMass–Volume Stoichiometry917Choose the best answerIn the reaction: 2Na + 2H₂O → 2NaOH + H₂ what volume of H₂ at STP (273 K and 1 atm) is produced by 23 g Na?A11.2 dm³B2.44 dm³C10.60 dm³D44.8 dm³ Like 0 Discuss 0Share
Sindh MDCAT 2020 Chemistry#Transition Elements#Variable Oxidation States918Choose the best answerThe transition element which does not show variable valency is: (Sindh MDCAT 2020)ACuBScCZnDCr Like 2 Discuss 0Share
LiquidsHydrogen Bonding in HF and Water919Choose the best answerWhich statement best describes hydrogen bonding in HF and H₂O?AAn individual H-bond in HF can be very strong, but water forms a more extensive hydrogen-bonded networkBHF does not form hydrogen bondsCWater does not form hydrogen bondsDHF has a higher boiling point than water Like 0 Discuss 0Share
Alcohols and PhenolsReaction of Alcohols with Hydrogen Halides920Choose the best answerIn substitution reactions of alcohols with hydrogen halides, the general reactivity order is:A1° > 2° > 3°B3° > 2° > 1°C2° > 1° > 3°D1° = 2° = 3° Like 0 Discuss 0Share