UHS MDCAT 2019 PAPER MDCAT PAPER (PART 9) 1. Which product is obtained by the hydrolysis of 1- chlorobutane with the aqueous sodium hydroxide ? Butanone 1-butanal 1-butanol 1-butene 2. Treatment of ethene with cold sulphuric acid followed by reaction with boiling water yields: Ethanol Ethane Ethanol Ethyne 3. The average atomic mass of Boron is 10.8. It has two isotopes of masses 10 and 11 respectively. What is the percentage of isotope with the average mass of 10? 80% 20% 50% 60% 4. In contact process, to which substance adequate quantities of water is added to convert it to sulphuric acid? H2S2O7 SO3 HSO4 SO2 5. Which of the equations shows the same “twice” the enthalpy change of neutralization as the following equation HCl+NaOH→NaCl+H2O MgCO3+2HCl → MgCl2+CO2+H2O KOH+HCl →KCl+H2O NH4Cl+NaOH → NaCI + H2O + NH3 H2SO4+Mg(OH)2 → MgSO4+2H2O 6. The decomposition of phosphorus pentachloride in the presence of moisture takes place by the following mechanism: The rate equation for this reaction will be: Rate=k (PCl5) (H2O) Rate=(PCl3) (H2O)^3 Rate=k (PCl5) (H2O)^4 Rate=(PCl5) (H2O) 7. The names of functional groups in the following compound X are: Secondary alcohol, nitrile and phenol ring Secondary alcohol, nitrile and benzene ring Secondary alcohol, nitrile and aryl ring Primary alcohol, nitrite and benzene ring 8. If the energy of activation of a chemical reaction is very low, the rate of that chemical reaction is observed to be very high because ? Reaction proceeds without any transition state Molecules of the reactants move slowly Number of efficient or fruitful collisions increase Concentration of the reactants becomes irrelevant 9. Which of the following compounds will give a secondary alcohol after reaction with NaBH4? CH3-CH2COOH CH3-COCH3 CH3-COOCH3 CH3-CH2CHO 10. Copper is a typical transition metal. Its atomic number is 29. In which oxidation state does it have partially filled orbital in d-subshell? Cu2+ Cu- Cu Cu+ 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
I get great benefit from this website . thanks for this.
Thank you, Quratulain, for visiting mdcat1.com! We greatly appreciate your valuable feedback. Thanks for the appreciation.