A 20 L vessel contains 0.1 mole of $O_2$ at 300 K. $O_3$ is prepared in the vessel by subjecting $O_2$ to silent electric discharge till the volume is reduced to 15 L at 300K. What is the number of moles of $O_3$ formed?

$26\,{\rm{mL}}$ of ${\rm{C}}{{\rm{O}}_2}$ are passed over hot coke. The maximum volume of CO formed is :

The volume of ammonia obtained by the complete combination of $10\,\,{\rm{mL}}$ of ${{\rm{N}}_2}$ and $30\,\,{\rm{mL}}$ of ${{\rm{H}}_2}$ is:

A mixture of ${\rm{2}}{\rm{.3}}\,\,{\rm{g}}$ formic acid and ${\rm{4}}{\rm{.5}}\,\,{\rm{g}}$ oxalic acid is treated with conc. ${{\rm{H}}_{{\rm{2}}\,}}{\rm{S}}{{\rm{o}}_{\rm{4}}}$ . The evolved gaseous mixture is passed through ${\rm{KOH}}$ pellets weight (in g) of the remaining product at STP will be