Question

Give reasons for the following:
a) Metals are regarded as electropositive elements
b) Aluminium oxide is called an amphoteric oxide
c) Sodium and potassium metals are kept immersed under kerosene oil
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Answer 1

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(a) An electropositive element is one that has tendency to lose electrons and form positively charged ion. Metals like Na, Mg, K, Ca, Fe, Zn lose electrons and form positively charged ion. Due to this metals are called electropositive elements.

(b) It is because it reacts with acids as well as bases to produce salts and water. 'Al’ is less electropositive metal. So, it forms amphoteric oxide which can react with acid as well as base.

(c) Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.

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Answer 2

Answer:

A)Metals have a tendency to lose one or two electrons to form positive ions. Therefore, metals are called electropositive elements.

B)Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases, such as hydrofluoric acid and sodium hydroxide, acting as an acid with a base and a base with an acid, neutralising the other and producing a salt.

C)Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.

Explanation:

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