Chemical KineticsEnergy Profile and Enthalpy Change2286Choose the best answerIn an energy profile, the energy of products is E₂ and the energy of reactants is E₃. Which relation is correct?AA catalyst changes ΔH.BA catalyst changes the energies of reactants and products.CΔH = E₂ − E₃DA catalyst converts an endothermic reaction into an exothermic reaction. Like 0 Discuss 0Share
GasesUniversal Gas Constant2287Choose the best answerThe value of the universal gas constant R in dm³·torr·mol⁻¹·K⁻¹ is approximately:A62400B8.314C62.4D0.0821 Like 0 Discuss 0Share
XIIMDCAT Chemistry Test#Isomerism#Optical Isomerism2288Choose the best answerA molecule is chiral if its mirror image is:ASuperimposable on itBNon-superimposable on itCAlways planarDIdentical after reflection Like 0 Discuss 0Share
Aldehydes and KetonesPreparation by Dehydrogenation of Alcohols2289Choose the best answerDehydrogenation of propan-2-ol over heated copper produces:APropanalBPropanoneCPropeneDPropanoic acid Like 0 Discuss 0Share
StoichiometryMass–Volume Stoichiometry2290Choose the best answerHow many litres of H₂ at STP are produced when 6.0 g Mg reacts with excess HCl? Mg + 2HCl → MgCl₂ + H₂A22.4 LB11.2 LC5.6 LDNone of these Like 0 Discuss 0Share