The gas produced by the action of conc. sulphuric acid on sodium chloride is :
Name the gas evolved in following case: The gas produced by the action of concentrated sulphuric acid on sodium chloride.
When conc. sulphuric acid is added to sodium chloride, sodium bisulphate and gas X is formed. If a rod dipped in ammonia is brought near gas X, dense white fumes of ammonium chloride are formed. What is X?