Water 1. How many average number hydrogen bonds a water molecule at room temperature and atmospheric pressure forms with other water molecules 4 2 3 3.4 None 2. How many of the following statement/s is/are correct I. At room temperature ice melts and is a spontaneous processII. Melting of ice and evaporation of water at room temperature has a negative ΔG III. Melting of ice and evaporation at room temperature are not spontaneous processes I II III All None 3. 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 4. Match the objects from group A with group B A. B Glucose 1. Non polar Palmitic acid 2. Polar Phenyl alanine 3. Amphipathic 1-1, 2-2, 3-3 1-2, 2-1, 3-3 1-3, 2-2, 3-1 None of the above None 5. Which of the following is not the strategy to transport the insoluble gases into the biological system Using an alternative gas Use of carrier proteins Chemical modification of the gaseous form All of the above. None 6. Which among the following is highly soluble in water O2 CO2 NH3+ Palmitic acid None 7. Life of hydrogen bonding in water Increases with heating Decreases with heating Stabilised by heating No change in the life of H-bonding None 8. In the most stable ‘native’ structure of the biomolecule weak interactions are maximised. True False None 9. 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 10. Which of the following chemical bond containing compound may not be soluble in water? N-H C-H O-H I&III None Time's up
