How So2 react with concentrated trioxonitrate (v) acid
Answers
Sulphur forms two main oxides; the gas sulphur dioxide (SO2) and the liquid sulphur trioxide (SO3). Sulphur dioxide is a dense colourless gas, which is soluble in water, and has a suffocating and unpleasant smell of burnt matches. It has a melting point of -72.7°C, and a boiling point of -10°C.
Sulphur dioxide gas can be made directly by heating its constituent elements. Burning molten sulphur in either air or pure oxygen leads to a reaction, which produces a pale blue coloured flame. This looks quite impressive in a darkened room.
S8 (l) + 8 O2 (g)  8 SO2 (g)

Sulphur 
Burning sulphur to
give a blue flame
An alternative laboratory preparation is to heat copper turnings with concentrated sulphuric acid (H2SO4), see image, right.
Cu (s) + 2 H2SO4 (aq)  CuSO4 (aq) + SO2 (g) + 2 H2O (l)
Sulphur dioxide is an acidic gas and this can easily be demonstrated by adding water and a few drops of universal indicator to a container of the gas. The resulting acid is the weakly dibasic acid sulphurous acid (H2SO3).
SO2 (g)  SO2 (aq)
SO2 (aq) + H2O (l)  H2SO3 (aq
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Answer:
Sulphur forms two main oxides; the gas sulphur dioxide (SO2) and the liquid sulphur trioxide (SO3). Sulphur dioxide is a dense colourless gas, which is soluble in water, and has a suffocating and unpleasant smell of burnt matches. It has a melting point of -72.7°C, and a boiling point of -10°C.
Sulphur dioxide gas can be made directly by heating its constituent elements. Burning molten sulphur in either air or pure oxygen leads to a reaction, which produces a pale blue coloured flame. This looks quite impressive in a darkened room.
S8 (1) + 8 02 (g) BJ 8 SO2 (g)