Water 1. As biological cells require large amount of glucose molecules which lead to increased osmolarity of the cytosol, which act by cells help keep the osmolarity at check? Active transport Faster metabolism Polymerisation None of the above. None 2. 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 3. Which of the following process does NOT lead to increase in the entropy? Melting Evaporation Freezing Heating None 4. What physical change will occur if the chemical structure of butane is changed to butanol? It will decrease octane value It will increase the boiling point No alteration in physical properties but changed chemical properties None of the above. None 5. 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 6. The fast mobility of the H3O+ is attributed to which of the following? Small molecular size High charge Proton Hopping mechanism All of the above None 7. Which of the following is true about electric dipole? It depends upon the electronegativity of the constituent atoms Larger the electronegativity greater the dipole moment Weak electronegative forms the strongest dipoles 1&2 None of the above. 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 true about dissolution of plan compounds in water? They replace the water-water molecular interaction They form energetically favourable interaction with water Only A Only B A&B None 10. Which of the following is true? Free hydrogen ion exist as a result of ionisation of water Ionisation product of the water i.e. H+ form a hydronium ion (H3O+) with H2O molecule Free H+ forms hydrogen bond to yield hydronium ion None of the above. None Time's up
