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Answers
What does the image represent?
The image represents the chemical reaction between dilute sulphuric acid and zinc granules.
What happened when dilute sulphuric acid over zinc granules?
An irreversible chemical reaction took place. The end products are colour zinc sulphate solution and the evolution of hydrogen gas.
Write the chemical equation.
H₂SO₄ + Zn --- ZnSO₄ + H₂
Knowledge Bytes
Metals and acids react with each other in a single displacement reaction to form a salt of the respective metal along with the evolution of hydrogen gas. Here the salt solution of zinc - zinc sulphate is formed along with H₂ gas.
How do we know that the gas evolved is hydrogen?
Usually the metal displaces the H+ ions in the acid which result in the evolution of hydrogen gas. This can be determined by bringing a burning candle near the test tube in which the reaction takes place. A pop sound can be heard which is produced by hydrogen near the hot oxygen gas.
➡ The given change is a chemical change. It is a single displacement reaction which is hydrogen gets displaced.
➡ A white coloured solution of zinc sulphate and the colourless hydrogen gas are the end products.