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3. Metals and Non-metals-Chapter Review Science Class 10 In English
Last Updated : 06 March 2026
Explore science Solutions for Class 10 Chapter 3. Metals and Non-metals Topic Chapter Review in English medium.
3. Metals and Non-metals-Chapter Review Science Class 10 In English
Last Updated : 06 March 2026
3. Metals and Non-metals-Chapter Review Science Class 10 In English
3. Metals and Non-metals
Chapter Review
Chapter Review:
- Metals, in their pure state, have a shining surface. This property is
called metallic lustre. - Some metals can be beaten into thin sheets. This
property is called malleability. - The ability of metals to be drawn into thin wires is called ductility.
- Gold is the most ductile metal a wire
of about 2 km length can be drawn from one gram of gold. - The metals that produce a sound on striking a hard surface
are said to be sonorous. - The best conductors of heat are silver and
copper. Lead and mercury are comparatively poor conductors of heat. - Full Form of PVC is polyvinylchloride.
- Gallium and caesium have very low melting points.
- Iodine is a non-metal but it is lustrous.
- Diamond, an allotrope of carbon, is
the hardest natural substance known and has a very high melting
and boiling point. - Graphite, another allotrope of carbon, is a conductor of electricity.
- Lithium, sodium, potassium are so soft that they can be cut with a knife. They have low densities and low melting points.
- Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open.Therefore they are kept immersed in kerosene oil.
- Anodising is a process of forming a thick oxide layer of aluminium.
- Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1.Aqua regia is a highly corrosive, fuming liquid.
- The metals at the top of the activity series (K, Na, Ca, Mg and Al) are so reactive that they are never found in nature as free elements.
- The metals in the middle of the activity series (Zn, Fe, Pb, etc.) are moderately reactive. They are found in the earth’s crust mainly as oxides, sulphides or carbonates.
- Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
- Cinnabar (HgS) is an ore of mercury.
- The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.
- The carbonate ores are changed into oxides by heating strongly in limited air. This process is known as calcination.
- Galvanisation is a method of protecting steel and iron from rusting
by coating them with a thin layer of zinc. - The rusting of iron can be prevented by painting, oiling, greasing,
galvanising, chrome plating, anodising or making alloys. - When iron is mixed with nickel and chromium, we get stainless steel, which is hard and does not rust.
- An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
- Pure gold, known as 24 carat gold, is very soft. It is, therefore, not suitable for making jewellery.
- The alloy of mercury is known as an amalgam.
- The extraction of metals from their ores and then refining them for use is known as metallurgy.
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NCERT Solutions for Class 10 science Chapter 3. Metals and Non-metals Topic Chapter Review
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About Chapter 3. Metals and Non-metals of Class 10 science
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3. Metals and Non-metals-Chapter Review Science Class 10 In English
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3. Metals and Non-metals-Chapter Review Science Class 10 In English Study Materials For Class 6 to 12
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