b. A solid is heated at constant rate. The variation of temperature with heat input is shown graphically.
i. What do OA and AB indicates in the figure? ​
ii. What is represented by the slope of BC? What is the reason behind the zero slope during the change of state?

b A solid is heated at constant rate The variation of temperature with heat input is shown graphically i What do OA and AB indicates in the figure ii What is re class=