UHS MDCAT 2019 PAPER MDCAT PAPER (PART 9) 1. Which product is obtained by the hydrolysis of 1- chlorobutane with the aqueous sodium hydroxide ? 1-butanal 1-butene Butanone 1-butanol 2. Treatment of ethene with cold sulphuric acid followed by reaction with boiling water yields: Ethyne Ethane Ethanol Ethanol 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? 50% 80% 20% 60% 4. In contact process, to which substance adequate quantities of water is added to convert it to sulphuric acid? HSO4 SO2 SO3 H2S2O7 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 NH4Cl+NaOH → NaCI + H2O + NH3 H2SO4+Mg(OH)2 → MgSO4+2H2O KOH+HCl →KCl+H2O 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=(PCl5) (H2O) Rate=k (PCl5) (H2O)^4 Rate=k (PCl5) (H2O) Rate=(PCl3) (H2O)^3 7. The names of functional groups in the following compound X are: Secondary alcohol, nitrile and aryl ring Primary alcohol, nitrite and benzene ring Secondary alcohol, nitrile and phenol ring Secondary alcohol, nitrile 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 Concentration of the reactants becomes irrelevant Number of efficient or fruitful collisions increase Molecules of the reactants move slowly 9. Which of the following compounds will give a secondary alcohol after reaction with NaBH4? CH3-COCH3 CH3-COOCH3 CH3-CH2CHO CH3-CH2COOH 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? Cu- Cu2+ 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
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