Identify a compound having properties of tear gas.

Which of the following series of emission spectral lines for hydrogen observed in visible region?

What is the number of faraday required to produce 0.18 g aluminium at cathode during electrolysis of molten $\mathrm{AlCl}_3$ ? (Molar mass of $\mathrm{Al}=27 \mathrm{~g} \mathrm{~mol}^{-1}$ )

Which pair of metal ions from following have same number of unpaired electrons?