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