Question

15 one.reason?..........

Answer 1

14)Two liquid drops have greater surface area than the single drop formed after their coalescence. So, coalescence reduces surface area. As surface area is decreased, energy corresponding to surface area, the surface tension energy, also reduces. Therefore, when two drops of same fluid merge, energy is released.
Hence, option 'A' is correct.
15) Option 'A' is correct as energy is liberated (exothermic).