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Materials : Metals And Non-Metals

Question
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You are given samples of three metals : Sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivity.

Solution

i) Reaction with oxygen : Sodium catches fire when kept open in the air, so sodium reacts very vigorously with oxygen.
Magnesium reacts with oxygen only on heating whereas copper reacts with oxygen on very strong heating. These reactions show that here sodium is the most reactive metal and copper is the least reactive metal. So, the decreasing order of reactivity is:

Sodium > Magnesium > Copper.

(ii) Reaction with water : Sodium reacts very vigorously even with cold water. Magnesium reacts slowly with cold water but rapidly with hot, boiling water, whereas copper does not react even with steam. This activity also shows that here sodium is the most reactive metal and copper is the least reactive metal. So, the order of their decreasing reactivity is : Sodium > Magnesium > Copper.

Some More Questions From Materials : Metals And Non-Metals Chapter

Phosphorus is very  ________  non-metal.

Metals are _______ conductor of heat and ________.

Iron is ________ reactive than copper.

Metals react with acids to produce ________ gas.

Generally, non-metals react with acids.

Sodium is a very reactive metal.

Copper displaces zinc from zinc sulphate solution.

Carbon can be drawn into wires.

Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of their properties.

Properties

Metals

Non-metals

1. Appearance

2. Hardness

3. Malleability

4. Ductility

5. Heat Conduction

6. Conduction of Electricity

  

Give reasons for the following :

Aluminium foils are used to wrap food items.

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