SINDH MDCAT 2015 PAPER MDCAT 2015 PART 6 ( CHEMISTRY ) 1. Physical properties od Ethyne is/are: It is less denser than air All of the above It explodes on compression to a liquid because of unstable nature It is colourless gas with sweet smell It is sparingly soluble in water 2. How will the equilibrium of the following reaction be affected if additional nitrogen is added N2 + 3H2 = 2 NH3(g) More NH will be produced It will be unaffected It will be shifted to the right The effect on the equilibrium cannot be determined without more information It will be shifted to the left 3. NH3 (amine) is an example of: Organic ligand Both Negative & Anionic ligand Neutral ligand Negative ligand Anionic ligand 4. The hybridization of atomic orbitals of N is N2NO3 and NH4 are respectively: sp2, sp, sp3 sp, sp2, sp3 sp, sp3, sp2 sp2, sp3, sp 5. The dipole moments of the given molecules(BF3, NF3, NH3) rae such that: NH3=BF3=NF3 NH3 > BF3 > NF3 BF3 > NF3 > NH3 NF3 > BF3 > NH3 NH3 > NF3 > BF3 6. The unit cell with crystallographic dimensions is: Cubic Hexagonal Monoclinic Tetragonal 7. H2O has a higher boiling point than HF because: H2O has a higher molecular weight H2O has more atoms H2O does not have a higher boiling point than HF H2O is more polar than HF H2O can form more hydrogen bonds 8. Which of the following best describes the emissiom spectrum of atomic hydrogen? a continuous emission of radiation of all frequencies a series of only four lines A discrete series of lines of equal intensity and equally spaces with respect to wavelength several discrete series of lines with both intensity and spacings between lines decreasing as the wave nymber increases with each series 9. Ethyl alcohol when treated with concentrated H2SO4 may give: all of the above only ethylene only diethyl sulphate only diethyl ether 10. Strontium lies between calcium and barium in Group IIA in the Periodic Table. Which of the following properties could be predicted for strontium? It forms a nitrate which decompose on heating to form strontium nitrite and oxygen It is reduced by cold water, liberating hydrogen It forms a water – soluble carbonate which does not decompose on heating. It forms a sparingly soluble sulphate Loading … Pages: 1 2 3 4 5 6 7 8 9
