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It slowly decomposes on exposure or on heating.
Water decomposes it violently with formation of hydrochloric and sulphurous acids.
Water decomposes it into hydrochloric and sulphurous acids.
It also burns when heated in a current of steam, which it decomposes with the liberation of hydrogen and the formation of magnesia.
It is unstable at ordinary temperatures and rapidly decomposes into its generators on warming.