Chapter 4 : Materials: Metals and Non-metals - Ncert Solutions for Class 8 Science CBSE
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Chapter 4 - Materials: Metals and Non-metals Excercise 53
Concept insight: Metals are malleable.
However, mercury metal - a liquid at room temperature - cannot be drawn into wires and is not ductile.
Concept insight: Ductility means that substance can be drawn into wires.
Chapter 4 - Materials: Metals and Non-metals Excercise 54
(b) Good, electricity
Concept insight: non metallic oxides are acidic in nature.
(ii) Sodium is a very reactive metal. (T)
(iii) Copper displaces zinc from zinc sulphate solution. (F)
Concept insight: in a displacement reaction more reactive element displaces less reactive metal from its salt.
(iv) Coal can be drawn into wires. (F)
Concept insight: Coal is a form of carbon which is a non metal.
Concept insight: metals are malleable.
(b) Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.
(c) A metal can displace a less reactive metal from its salt in an aqueous solution. But zinc is more reactive than copper. Therefore, copper cannot displace zinc from its salt solution.
Cu(s) + ZnSO4 (aq) No reaction
Concept insight: in a displacement reaction more reactive element displaces less reactive elment.
(d) Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.
Concept insight: sodium and potassium are so highly reactive that they react with water vapour present in air. So they are stored in kerosene.
Concept insight: acids react with metals and produce salt and hydrogen.
Chapter 4 - Materials: Metals and Non-metals Excercise 55
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