UHS MDCAT 2019 PAPER MDCAT PAPER (PART 13) 1. Which type of reaction takes place when a carbonyl compound is treated with a mixture of NaCN and an acid? Nucleophilic addition reaction Displacement reaction Substitution reaction Electrophilic addition reaction 2. Disposable cups are made of a polymer polystyrene. Polystyrene is: A condensation polymer A polyamide A polyester An addition polymer 3. During stoichiometric calculations, which of the following laws must be followed? Law of conservation of energy Law of conservation of mass Avogadro’s law Dalton’s law 4. Which of the following element is not present in halogens? Cl Fe I F 5. Which enthalpy change is relevant in the following process Na(s) → Na(g) ΔH= + Enthalpy of fusion Enthalpy of vaporization Enthalpy of atomization Enthalpy of formation 6. Which of the following substances exhibits hydrogen bonding? NH3 H2S HI SiH4 7. Which balanced chemical equation show the formation of ethanoyl chloride using thionyl chloride? 8. The number of moles of water in 1Kg ice are 100 moles 50 moles 1000 moles 55.5 moles 9. For an equilibrium reaction; 2S02(g) + 02(g) 2S03(g) the forward reaction is exothermic, increase in temperature shifts the equilibrium position towards left because, The concentrations of SO2 and 02 decrease and concentration of S03 increases as the temperature increases The concentrations of SO2 and 02 increase and concentration of S03 stays same as the temperature increases The concentrations of SO2 and 02 increase and concentration of S03 decreases as the temperature increases The concentrations of S03, SO2 and 02 increase as the temperature increases 10. Keeping in view the values of standard reduction potential given below, which one of the following would you select as a feasible redox chemical reaction? Loading … Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
in question no 10
the type of energy reduced by the enzymes for biological reactions to occur is called ACTIVATION ENERGY
at here the correct answer is active energy which is wrong