Class 10 NCERT Solutions Metals and Nonmetals - NCERT Solutions prepared for CBSE students by the best teachers in Delhi.
Class X Chapter 3 – Metals and Non-metals Science
Question 1: Give an example of a metal which
(i) is a liquid at room temperature.
(ii) can be easily cut with a knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.
Answer(i) Metal that exists in liquid state at room temperature → Mercury
(ii) Metal that can be easily cut with a knife → Sodium
(iii) Metal that is the best conductor of heat → Silver
(iv) Metals that are poor conductors of heat → Mercury and lead
Question 2: Explain the meanings of malleable and ductile.
Answer Malleable: Substances that can be beaten into thin sheets are called malleable. For example, most of the metals are malleable. Ductile: Substances that can be drawn into thin wires are called ductile. For example, most of the metals are ductile.
Question 3: Define the following terms.
(i) Mineral (ii) Ore (iii) Gangue
(i) Mineral: Most of the elements occur in nature as in combined state as minerals. The chemical composition of minerals is fixed.
(ii) Ore: Minerals from which metals can be extracted profitably are known as ores.
(iii) Gangue: The impurities (sand, silt, soil, gravel, etc.) present in the ore are called gangue.
Question 4: Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water
(i) Write the electron-dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of Na2O and MgO by the transfer of electrons.
(iii) What are the ions present in these compounds?
Question 6: Name two metals which are found in nature in the free state.
Question 7: What chemical process is used for obtaining a metal from its oxide?
Question 8: Which metals do not corrode easily?
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