Chapter 3 · Metals and Non-metals

NCERT Class 10 Science Chapter 3 Intext Questions (Page 40)

All 2 questions of NCERT Class 10 Science Chapter 3 Intext Questions (Page 40) — Metals and Non-metals — in the book's order, each with its answer and a step-by-step solution.

1. Q1
   Give an example of ​a ​metal which

   1. (i)is ​a ​liquid at room temperature.
   2. (ii)​can be easily cut ​with a ​knife.
   3. (iii)is the best conductor of heat.
   4. (iv)is a poor conductor of ​heat.
   Show answer

   Mercury is a liquid at room temperature, sodium can be cut with a knife, silver conducts heat best and lead conducts it poorly.

   (i) Mercury (Hg) is a liquid at room temperature; (ii) Sodium (Na), or any other alkali metal such as potassium or lithium, can be easily cut with a knife; (iii) Silver (Ag) is the best conductor of heat; (iv) Lead (Pb), or mercury, is a poor conductor of heat.

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2. Q2
   Explain the ​meanings of ​malleable ​and ​ductile.
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   Malleable means can be beaten into thin sheets; ductile means can be drawn into thin wires.

   Malleable: a metal is malleable when it can be beaten (hammered) into thin sheets without breaking; gold and silver are the most malleable metals. Ductile: a metal is ductile when it can be drawn into thin wires; gold is the most ductile metal, and about 2 km of wire can be drawn from one gram of gold. Because of these two properties, metals can be given different shapes according to our needs.

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