Sindh MDCAT 2019 Paper 101- Paramagnetic elements contain: A. All paired electronsB. All unpaired electrons C. Few unpaired electronsD. Unequal electrons and protons View Answer Answer : C. Few unpaired electrons Description 102- How many atmospheres correspond to 1050 torr? A. 1.050B. 10.38C. 1.380D. 2.760 View Answer Answer : C. 1.380 Description 103- The mass of an electron is: A. 0.000550 amuB. 1.008 amu C. 1.009 amuD. 0.5500 amu View Answer Answer : A. 0.000550 amu Description 104- The rate of E1 reaction depends upon: A. The concentration of substrateB. The concentration of nucleophileC. The concentration of nucleophile and substrate D. The amount of the solvent used View Answer Answer : A. The concentration of substrate Description 105- The number of bonds in nitrogen molecules are: A. One σ and one π B. One σ and two πC. Three σ onlyD. Two σ and one π View Answer Answer : B. One σ and two π Description 106- An ionic compound A+B- is most likely to be formed when: A. The ionization energy of A is high and electron affinity of B is low B. The ionization energy of A is low and electron affinity of B is highC. Both ionization energy of A and electron affinity of B are equal D. Both ionization energy of A and electron affinity of B are high View Answer Answer : B. The ionization energy of A is low and electron affinity of B is high Description 107- The electrophile in aromatic sulphonation is: A. H2SO4B. HSO4C. SO3H+D. SO3 View Answer Answer : C. SO3H+ Description 108- Choose the correct IUPAC name for the following complex. [Cr(NH3)4Cl2]Cl A. Trichlorotetra amine chromium (III) B. Dichlorotetra amine chromium (III) chlorideC. Dichlorotetra ammonia chromium (III) chloride D. Dichlorotetra amine chromate (III) chloride View Answer Answer : B. Dichlorotetra amine chromium (III) chloride Description 109- SN² reactions can be best carried out with: A. Primary alkyl halidesB. Secondary alkyl halides C. Tertiary alkyl halides D. Both primary and tertiary alkyl halides View Answer Answer : A. Primary alkyl halides Description 111- The pH of 10-3 mol dm-3 0f an aqueous solution of H2SO4 is: A. 3.0B. 2.7C. 2.0D. 1.5 View Answer Answer : B. 2.7 Description 112- The oxidation state of Cl in HClO4 is: A. +1B. +5C. +7D. -7 View Answer Answer : C. +7 Description 113- In a zero order reaction, the rate is independent of: A. concentration of reactionB. temperature of reactionC. concentration of products D. catalyst used View Answer Answer : A. concentration of reaction Description 114- Which one of the following is NOT a nucleophile? A. CN- B. NH3C. H2SD. BF3 View Answer Answer : D. BF3 Description 115- Which of the following molecules have zero dipole moments? A. NH3B. CHCl3C. H2OD. BF3 View Answer Answer : D. BF3 Description 116- The ligand field effect splits five degenerated d-orbitals into two sets with different energies, the pair of high energy degenerate orbitals is: A. dxy , dyzB. dyz , dzxC. dx2-y2 , dz2D. dx2-y2 , dy2 View Answer Answer : C. dx2-y2 , dz2 Description 117- The change in heat energy of a chemical reaction at constant temperature and pressure is called: A. Enthalpy changeB. Heat of sublimation C. Internal energy changeD. Heat of formation View Answer Answer : A. Enthalpy change Description 118- A catalyst increases the rate of reaction by: A. decreasing the activation energyB. decreasing the concentration of reactantsC. decreasing the temperatureD. increasing the temperature View Answer Answer : A. decreasing the activation energy Description 119- The unit cell parameters of mono clinic system are: A. a=b≠c α=β=γ=90°B. a≠b≠c α=γ=90° β≠90°C. a≠b=c α=β=90° γ≠90° D. a=b=c α=β=γ=90° View Answer Answer : B. a≠b≠c α=γ=90° β≠90° Description 120- Which of the following will have maximum value of heat of hydration? A. NatB. CstC. Mg+²D. Ca+² View Answer Answer : C. Mg+² Description 1 2 3 4 5 6 7 8 9 10
