Is carbon monoxide is a poisonous gas.

Yes carbon monoxde is a poisonous gas

Carbon monoxide is a poisonous gasCarbon monoxide poisoning occurs after enough inhalation of carbon monoxide (CO). Carbon monoxide is a toxic gas, but, being colorless, odorless, tasteless, and initially non-irritating, it is very difficult for people to detect.

Your limiting reagent is NaOH and your excess is H2SO4 with 0.025 mol in excess.