Calculate the energy per mole of photon of electromagnetic radiation having wavelength $700 \mathrm{~nm}\left[\mathrm{~h}=6.626 \times 10^{-34} \mathrm{Js}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right]$

Which of the following molecules consist minimum lone pair of electrons in the valence shell of central atom?

What is the SI unit of rate of diffusion for a gas?

Which of the following gases causes depletion in ozone layer?