Hydrogen sulphide gas.

1.     A few pieces of iron sulphide are taken in a flat bottom flask fitted with a thistle funnel and a delivery tube.
2.     The apparatus is arranged as shown in the figure.
3.     Dilute HCl or dilute H2SO4 is added through the thistle funnel so that the lower end of the funnel dips into the acid.
4.     The reaction takes place instantly, and hydrogen sulphide (H2S) gas is evolved. It is then collected in gas jar by the upward displacement of air.

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