Water 1. What is a cohesive force? Intermolecular force of attraction A forcer that hold matter together These are coulombs forces A, B&C None 2. Hydrogen bonds can only be formed between H and OH of the water molecule? False True None 3. Which of the following phenomenon does not contribute to the mechanical strength of the plant body? Acquisition of the high solute concentration in the vacuole Pressure exerted by the swelling of the cell on the non-expansing cell wall Both I&II None 4. Which of the following leads to the formation of the dipole in the molecule? Electronegativity High molar mass Strong force of attraction between two molecules Hydrophobicity None 5. Hydrogen bond are strongest when Kinetic energy of the participating compounds is highest Both participating electronegative elements are same They are present in the hydrophobic environment Hydrogen elements and participating electronegative elements are in a straight line 1 & 2 3 & 4 None 6. Which of the following will have high heat of vaporisation? CH3OH CH3CH2OH Water CH3CH2CH2OH None 7. The importance of hydrogen bonds in biology is/are that, They are essential in the formation of the three dimension structures of the protein and other biomolecules High heat capacity of the water due hydrogen bonding confers resistant to sudden temperature changes in the body of the organism Formation of the stable cell membranes in aquatic solutions. All of the above None of the above None 8. Which of the following process does NOT lead to increase in the entropy? Melting Evaporation Freezing Heating None 9. Water molecule is polar because Oxygen attracts shared electron strongly There are two electric dipoles in the water Electrostatic attraction between H and O of the single molecule All of the above 1&2 None 10. What is true about the strength of the hydrogen bonding Directionality of the participating elements in the hydrogen bonding influence the strength of the hydrogen bonds Electronegativity difference in the elements might cause the difference in the hydrogen bond strength They get weaker if the kinetic energy of the molecule increases All of the above I & II None Time's up
