Question

State the observation when dilute sulphuric acid react with iron sulphide. *

1) Colourless and pungent smell gas is evolved which turns Nesslers reagent brown.
2) Colourless and burnt sulphur smell gas is evolved which turns dichromatic solution green.
3) Colourless and odourless gas is evolved which turns lime water milky.
4) Colourless and rotten egg smell gas is evolved which turns lead acetate paper silvery black.

Answer 1

Answer:

b) Colourless and burnt sulphur smell gas is evolved which turns dichromatic solution green.

FeSO4 H₂S

Explanation:

Due to the double displacement reaction, the reaction between iron sulfide and dilute sulfuric acid leads to the formation of Ferrous sulfate and hydrogen sulfide gas.