Does lightning on Venus affect the chemical composition of the clouds?
Observations by many spacecraft that have visited Venus over the last
40 years appear to confirm the presence of lightning storms in the
Venus atmosphere. Recent observations by Venus Express indicate that
lightning frequency and power is similar to that on Earth. While
storms are occurring, energy deposition by lightning into Venus
atmospheric constituents will immediately dissociate molecules into
atoms, ions and plasma from the high temperatures in the lightning
column (&gt;30,000 K) and the associated shock waves and heating, after
which these atom and ion fragments of C,O,S,N,H-containing molecules
will recombine during cooldown to form new sets of molecules. Spark
and discharge experiments suggest that lightning
effects on the main atmospheric molecules CO2, N2, SO2, H2SO4 and H2O
will yield carbon oxides and suboxides (COm, CnOm), sulfur oxides
(SnO, SnOm), oxygen (O2), elemental sulfur (Sn), nitrogen oxides (NO,
N2O, NO2), sulfuric acid clusters (HnSmOx−.aHnSmOx e.g. HSO4−.mH2SO4),
polysulfur oxides, carbon soot and other exotic species. While the
amounts generated in lightning storms would be much less than that
derived from photochemistry, during storms these species can build up
in a small area and so their local concentrations may increase
significantly. [...]

Source: M.L. Delitsky, K.H. Baines, Storms on Venus: Lightning-induced chemistry and predicted products, Planetary and Space Science, Volumes 113–114, 2015,Pages 184-192, 10.1016/j.pss.2014.12.005