The minimum energy needed to remove an electron from a metal corresponds to a wavelength of 500 nm . What is the total kinetic energy of all the photoelectrons ejected per second when the entire radiation from a 100 Watt bulb with a wavelength of 300 nm falls on the surface of the metal? [Planck's constant $=6.6 \times 10^{34} \mathrm{Js}$; speed of light $=3 \times 10^8 \mathrm{~ms}^{-1}$ ]

For a reaction $R \rightarrow P$ with a rate constant of $3 \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$, which one of the following plots is correct? (Given [R] $]_0$ is the initial concentration of $R$ and $[R]$ is the concentration of $R$ at time t)

Which one of these plots correctly describes the variation of osmotic pressure ( $\Pi$ ) of a fixed amount of a solute against the volume $(\mathrm{V})$ of the solution at a fixed temperature?

Consider the following data for KCl solution at a particular temperature. What is the value of the limiting molar conductivity?

$$ \begin{array}{|c|c|} \hline \text { Concentration }\left(\mathrm{mol} \mathrm{~L}^{-1}\right) & \text { Molar Conductivity }\left(\mathrm{S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\right) \\ \hline 1 \times 10^{-4} & 149.1 \\ \hline 9 \times 10^{-4} & 147.1 \\ \hline \end{array} $$