Water 1. Which of the following mechanism is employed by multicellular animals to avoid osmotic lysis? Presence of non-expandable cell wall Increasing concentration of certain proteins in blood plasma Active transport of Na+ ions in the interstitial fluids. All of the above 2&3 None 2. Which of the following process does NOT lead to increase in the entropy? Melting Evaporation Freezing Heating None 3. Which of the following is true about van der Waals forces These are not long range forces These forces can be present in hydrophobic groups also Random variation in electron clouds pose transient separation of charges All of the above None 4. Which of the atom may lead to greater electric dipole moment? Oxygen Hydrogen Carbon All of them will form equal electric dipole moment None 5. Why hydrogen bonds are said to be 10% covalent and 90% electrostatic? Because of the intermolecular sharing of the electrons Overlapping in the bonding orbitals O-H bonds are partial covalent bond All of the above None 6. Which of the following chemical bond containing compound may not be soluble in water? N-H C-H O-H I&III None 7. Interaction of water with amphipathic molecules leads to decreased entropy because? Hydrophobic portions of the molecule cluster together Water molecules form an orderly arrangement on the surface of the hydrophobic portion Both None 8. Which of the following is true about the ion product of water? It is also represented as Kw It is calculated as [H+][OH−] It constant at 25◦C All of the above None 9. What is a cohesive force? Intermolecular force of attraction A forcer that hold matter together These are coulombs forces A, B&C None 10. Which is true about biologically important gases? N2, O2 and Co2 are the biologically important gases They are non polar Movement of them from gaseous phase to aqueous phase decrease the entropy All of the above None Time's up
