SINDH MDCAT 2015 PAPER MDCAT 2015 PART 6 ( CHEMISTRY ) 1. Physical properties od Ethyne is/are: It explodes on compression to a liquid because of unstable nature It is colourless gas with sweet smell It is sparingly soluble in water All of the above It is less denser than air 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 It will be unaffected It will be shifted to the right It will be shifted to the left More NH will be produced 3. NH3 (amine) is an example of: Negative ligand Neutral ligand Anionic ligand Both Negative & Anionic ligand Organic ligand 4. The hybridization of atomic orbitals of N is N2NO3 and NH4 are respectively: sp2, sp, sp3 sp, sp3, sp2 sp2, sp3, sp sp, sp2, sp3 5. The dipole moments of the given molecules(BF3, NF3, NH3) rae such that: NH3 > BF3 > NF3 NH3=BF3=NF3 BF3 > NF3 > NH3 NH3 > NF3 > BF3 NF3 > BF3 > NH3 6. The unit cell with crystallographic dimensions is: Tetragonal Cubic Monoclinic Hexagonal 7. H2O has a higher boiling point than HF because: H2O is more polar than HF H2O does not have a higher boiling point than HF H2O has a higher molecular weight H2O has more atoms 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 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 a series of only four lines 9. Ethyl alcohol when treated with concentrated H2SO4 may give: all of the above only diethyl sulphate only ethylene 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 sparingly soluble sulphate 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. Loading … Pages: 1 2 3 4 5 6 7 8 9
