CBSE Class 10 Science 2020 · Paper 31/C/1 · Question 16
How do metal carbonates and metal hydrogen carbonates react with acids ? Taking magnesium as metal, write balanced chemical equations in both the cases. State the method to test the gas evolved in the reactions.
Answer
Carbonates and hydrogen carbonates give salt, carbon dioxide and water with acids; the gas turns lime water milky.
Metal carbonates and metal hydrogen carbonates react with acids to give a salt, carbon dioxide and water.
Test: pass the gas evolved through lime water; it turns milky because insoluble calcium carbonate forms, , which shows that the gas is carbon dioxide.
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