LiquidsBoiling Point and Atmospheric Pressure261Choose the best answerWater can boil at about 95°C at high altitude because:AAtmospheric pressure is lowerBAtmospheric pressure is higherCWater has no vapour pressureDHydrogen bonding disappears Like 0 Discuss 0Share
MDCAT Chemistry Paper 2025#Alkynes#Chemistry of Hydrocarbons262Choose the best answerThe IUPAC name of Vinyl acetylene is: (IBA MDCAT 2025)ABut-1-en-3-yneBBut-3-en-1-yneCPent-3-en-1-yneDPent-2-en-4-yne Like 8 Discuss 0Share1
StoichiometryMole Concept and Number of Molecules263Choose the best answerWhich sample contains the maximum number of molecules?A11.2 L O₂ at STPB16 g CH₄C14 g N₂D44.8 L NH₃ at STP Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Alpha Particles#Radioactivity264Choose the best answerWhat are the mass number and charge of an α particle?A1 and +1B2 and +1C4 and +2D0 and 0 Like 0 Discuss 0Share
Chemical KineticsEffect of Temperature on Reaction Rate265Choose the best answerThe large increase in reaction rate with increasing temperature is mainly because:ACollision frequency decreases.BThe fraction of molecules with energy equal to or greater than Ea increases.CMean free path decreases only.DActivation energy decreases. Like 0 Discuss 0Share