Two experiments P and Q are performed with water in various states of phases. Both experiments are performed at constant pressures. Heat is supplied to the systems at the same constant rate in both the experiments. The latent heat of fusion, vapourisation and sublimation of water are respectively $334 \mathrm{~kJ} / \mathrm{kg}, 2501$ $\mathrm{kJ} / \mathrm{kg}$ and $2834 \mathrm{~kJ} / \mathrm{kg}$. The phase diagram of water and the temperature-time schematic plots of the two experiments are depicted below (bold curve for P and dashed curve for Q ). Then one can conclude that

• Correct answer
  A

  the initial mass of water in P is equal to that in Q .
• Correct answer
  B

  at time $t_0, \mathrm{P}$ is in a pure phase while Q is in a mixed phase.
• Correct answer
  C

  experiment P has been performed at a pressure higher than Q.
• D

  at $t \gt t_0$, Q goes to the liquid state.

Hence, the correct answer is options: 'A', 'B', 'C'.