Multiple choice Among the following -------------------------- is used in the manufacturing of paper. barium peroxide barium sulphide barium sulphite yttrium barium copper oxide Reveal answer Fill a bubble to check yourself C Correct answer Explanation Barium sulphite is the barium salt of sulphurous acid with the chemical formula BaSO3. It is a white powder which is used in paper manufacturing. Like other barium compounds, it is toxic.