To an eudiometry tube 20 ml of A(g), 40 ml of B(g), 30 ml of D(g) and 60 ml of C(g) is introduced and subjected to sparking to cause following reaction with 100% extent. Calculate the volume chang involved due to sparking.

$\begin{array}{l}2\mathrm{A}\left(\mathrm{g}\right)+4\mathrm{B}\left(\mathrm{g}\right)⟶3\mathrm{P}\left(\mathrm{g}\right)+\mathrm{Q}\left(\mathrm{l}\right)\\ 3\mathrm{C}\left(\mathrm{g}\right)+\mathrm{D}\left(\mathrm{g}\right)⟶2\mathrm{P}\left(\mathrm{g}\right)+4\mathrm{R}\left(\mathrm{g}\right)\end{array}$

Eudiometry Tube: To measure change in volume in a gas mixture following a physical are chemical change.

Initial Final $$\begin{gathered} 2\mathrm{A}\left(\mathrm{g}\right)+4\mathrm{B}\left(\mathrm{g}\right)\to 3\mathrm{P}\left(\mathrm{g}\right)+\mathrm{Q}\left(\mathrm{l}\right) \\ \underset{-}{20 } \underset{-}{40} \underset{30}{-} \underset{\mathrm{x}}{ -} \end{gathered}$$

Initial Final $$\begin{gathered} 3\mathrm{C}\left(\mathrm{g}\right)+\mathrm{D}\left(\mathrm{g}\right)\to 2\mathrm{P}\left(\mathrm{g}\right)+4\mathrm{R}\left(\mathrm{g}\right) \\ 60 \underset{10}{30} \underset{40}{ -} \underset{80}{ -} \end{gathered}$$

$∆{\mathrm{V}}_1=60-300=3\mathrm{L}$

$∆{\mathrm{V}}_2=120-80=40\mathrm{L}$

$$\begin{gathered} ∆{\mathrm{V}}_2-∆{\mathrm{V}}_1=40-30 \\ =10\mathrm{mL} \end{gathered}$$