Reversible and Irreversible Changes

Observe the given processes $1$ and $2$ carefully.

Which of the following statements are correct?
I. Bubbles are formed in process $1$ while no bubble formation takes place in process $2$.
II. Process $1$ is slow while process $2$ is fast.
III. Process $1$ occurs at $100°\mathrm{C}$ only while process $2$ can occur at any temperature.

A potter shapes pots out of clay (Process $1$). He then bakes the pots in an oven (Process $2$). Which of the following statements is correct?

Study the given flow chart carefully.

Which of the following is correct?

Rohan tore a sheet of paper into pieces and then burnt them. Identify the irreversible change taking place in the process.

Raveena covered a beaker of boiled water with a metal tray as shown in the diagram.

The beaker and metal tray were then removed from the tripod stand and left on the table. After two minutes, which of the following can be observed?