Predict the sign of $q,w$ and $∆\mathrm{U}$ for given process.

S.NO	Process	q	w	$∆\mathrm{U}$
1	Combustion to benzene in a sealed container with rigid adiabatic wall.
2	Combustion to benzene in a sealed container that is immersed in a water bath at $25°C$ and has rigid, thermally conducting walls.
3	Adiabatic expansion of non-ideal gas into vacuum

Hence, find number of process for which at least one of $q,w,\mathrm{\Delta }U,\mathrm{\Delta }H$ are zero