Chemistry - Redox Reactions Question with Solution | TestHub

1/2 mol of gas at 0°C = 11.2 L at 1 atm = 22.4 L at 0.5 atm; 1/4 mol = 5.6 L at 1 atm = 11.2 L at 0.5 atm. (A) ${\mathrm{H}}_2$ $\to$ $2{\mathrm{H}}^{+}$ + $2{\mathrm{e}}^{-}$: 1 eq = 1/2 mol (Q, R). (B) $\mathrm{C}{\mathrm{H}}_4$ + $2{\mathrm{O}}_2$ $\to$ $\mathrm{C}{\mathrm{O}}_2$ + $2{\mathrm{H}}_2\mathrm{O}$: 2.8 L $\mathrm{C}{\mathrm{H}}_4$ needs 5.6 L ${\mathrm{O}}_2$ at the same T, P (P), equally 11.2 L at 0.5 atm (S). (C) $\mathrm{C}{\mathrm{l}}_2$ + $2{\mathrm{e}}^{-}$ $\to$ $2C{\mathrm{l}}^{-}$: 1 eq = 1/2 mol (Q, R). (D) ${\mathrm{O}}_2$ + $4{\mathrm{e}}^{-}$ $\to$ $2{\mathrm{O}}^{2-}$: 1 eq = 1/4 mol (P, S).