Dry ice is

A block of ice at $- 10°C$ is slowly heated and converted to steam at $100°C.$ Which of the following curves represents the phenomenon qualitatively

A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as

Liquid oxygen at $50\  K$ is heated to $300\  K$ at constant pressure of $1\  atm$. The rate of heating is constant which of the following graphs represents the variation of temperature with time

Triple point of water is