An organic compound ${}^{\text{'}}\mathrm{X}^{\text{'}}$ has a melting point of $-33°\mathrm{C}$ and a boiling point of $66°\mathrm{C}$ . The physical states of substance ${}^{\text{'}}\mathrm{X}^{\text{'}}$ at temperature $-100°\mathrm{C}, 0°\mathrm{C}$ and $100°\mathrm{C}$ are respectively

An experiment is performed as shown in the given figure.

The conclusion we can draw from the given experiment is that:

Ritwik was given four inflammable substances $\mathrm{P}, \mathrm{Q}, \mathrm{R}$ and $\mathrm{S}$. He was asked to hand over them to Ramesh who was the resident of a hot area (temperature, $46°\mathrm{C}$). Ritwik collected the data about the substances as shown in the table. Which substances Ritwik should not carry to the hot area where Ramesh lives?

Observe the given figure carefully.

Which of the following statements is incorrect?

The given apparatus is used to study the diffusion of a number of gases at the same temperature and pressure.

Which of the following pairs of gases would diffuse into the vacuum at the same speed? [Given: Atomic mass of $\mathrm{H}=1\mathrm{u}, \mathrm{C}=12\mathrm{u}, \mathrm{N}=14\mathrm{u}, \mathrm{S}=32\mathrm{u}, \mathrm{O}=16\mathrm{u}$]

Diagrams $\mathrm{W}, \mathrm{X}$ and $\mathrm{Y}$ show how the particles of a substance are packed at different temperatures.

The given graph shows the temperature changes which occur on warming the substance. In which region of the graph would all the particles be packed as in $\mathrm{Y}$?

Observe the given diagram showing the change in state carefully.

Which of the following is correct identification for processes $\mathrm{P}$ to $\mathrm{U}$?