SINDH MDCAT 2015 PAPER MDCAT 2015 PART 6 ( CHEMISTRY ) 1. Physical properties od Ethyne is/are: It is less denser than air It is colourless gas with sweet smell It explodes on compression to a liquid because of unstable nature All of the above 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 shifted to the right It will be unaffected 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: Neutral ligand Organic ligand Negative ligand Anionic 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: NH3=BF3=NF3 NF3 > BF3 > NH3 NH3 > NF3 > BF3 NH3 > BF3 > NF3 BF3 > NF3 > NH3 6. The unit cell with crystallographic dimensions is: Cubic Hexagonal Monoclinic Tetragonal 7. H2O has a higher boiling point than HF because: H2O is more polar than HF H2O has a higher molecular weight H2O does not have a higher boiling point than HF H2O has more atoms H2O can form more hydrogen bonds 8. Which of the following best describes the emissiom spectrum of atomic hydrogen? A discrete series of lines of equal intensity and equally spaces with respect to wavelength a continuous emission of radiation of all frequencies 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: only diethyl ether all of the above only diethyl sulphate only ethylene 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 water – soluble carbonate which does not decompose on heating. 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 sparingly soluble sulphate Loading … Pages: 1 2 3 4 5 6 7 8 9
