Metals and non-metals intext questions
Answers
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4
Answer: When a reactive metal reacts with dilute hydrochloric acid, hydrogen gas is produced. The chemical equation for reaction between iron and dilute hydrochloric acid is as follows:
Fe + H2SO4 ⇨ FeSO4 + H2
What would you observe when zinc is added to a solution of iron(II) sulphate? Write the chemical reaction that takes place.
Answer: Zinc displaces iron from iron (II) sulphate solution because zinc is more reactive than iron. This reaction can be shown by following equation:
Zn + FeSO4 ⇨ ZnSO4 + Fe
Why do ionic compounds have high melting points?
Answer: The force of attraction in ionic bonds is very strong and it is difficult to overcome that force. Hence, ionic compounds have high melting points
Define the following terms.
MineralAnswer: A substance which naturally occurs in the earth’s crust and has a uniform composition is called mineral.Ore
Answer: A mineral from which a substance can be profitably extracted is called an ore.Gangue
Answer: The impurities present in an ore are called gangue
.Why do ionic compounds have high melting points?
Answer: The force of attraction in ionic bonds is very strong and it is difficult to overcome that force. Hence, ionic compounds have high melting points.Define the following terms.Mineral
Answer: A substance which naturally occurs in the earth’s crust and has a uniform composition is called mineral.Ore
Answer: A mineral from which a substance can be profitably extracted is called an ore.Gangue
Answer: The impurities present in an ore are called gangue.