© examsnet.com
Question : 5
Total: 13
SECTION - B
Give reasons:
(a) An increase in temperature is observed on mixing chloroform and acetone.
(b) Aquatic animals are more comfortable in cold water than in warm water.
Solution:
(a) On addition of chloroform and acetone, chloroform forms strong hydrogen bonding with acetone.
This results in release of energy due to increase in attractive forces. Hence, the dissolution is an exothermic process.
(b) At a given pressure, the solubility of oxygen in water increases with decrease in temperature. Therefore, the concentration of oxygen in sea is more in cold water and thus, the presence of more oxygen at lower temperature makes the aquatic animals more comfortable in cold water.
This results in release of energy due to increase in attractive forces. Hence, the dissolution is an exothermic process.
(b) At a given pressure, the solubility of oxygen in water increases with decrease in temperature. Therefore, the concentration of oxygen in sea is more in cold water and thus, the presence of more oxygen at lower temperature makes the aquatic animals more comfortable in cold water.
© examsnet.com
Go to Question: