7 g of iron filings and 4 g of sulphur powder is treated with dilute sulphuric acid at room temperature. Name the gas produced.
Q. (a) 7 g of iron filings and 4 g of sulphur powder is treated with dilute sulphuric acid at room temperature. Name the gas produced.
(b) The same mixture is heated strongly, cooled and then treated with dilute sulphuric acid. Which gas would be produced?
(c) What is the cause of this difference in results of chemical reaction in different conditions ?
Ans.
(a) The mixture of iron filings and sulphur reacts with dilute sulphuric acid to produce hydrogen gas at room temperature.
(b) When the mixture is strongly heated in a fixed ratio 7: 4 to form compound namely iron sulphide, when cooled and treated with dil. sulphuric acid gives rotten egg smelling. Hydrogen sulphide gas is evolved.
(c) The difference in behaviour is due to properties of compound which are different from those of its constituents, while properties of mixture are the same as the properties of the constituents.
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