Question

a white compound produces a mixture of gases when heated. his mixture turns moist universal indicator paper red and relights a glowing splint. what does this mixture contain?

Answer 1

pure magnesium nitrate

Answer 2

the gas mixture contains oxygen because it relights the splint. the mixture also contains a gas which combines with water to produce an acid.
pure magnesium nitrate would to this - i think the other gas in the mixture will be an oxide of nitrogen.