Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.
(a) Aluminium is highly malleable and it can be easily beaten in sheets to make its foil for wrapping purposes. It is also soft and does not react with food items. This is why aluminium foils are used to wrap food items.
(b) Immersion rods are made up of metallic substances because metals are good conductors of heat and electricity. They get hot very soon on the passage of electric current and warm the water.
(c) Copper is less reactive than zinc, hence, it cannot displace zinc from its solution.
(d) Sodium and potassium are highly reactive, so they are stored in kerosene.
[Extra information: Some properties of metals are given below:
- The density of metals is usually high.
- Metals are malleable and ductile.
- Metals form an alloy with other metals or non-metals.
- Some metals react with air and corrode. For e.g. Iron.
- Metals are good conductors of heat and electricity. Lead is an exception.]
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