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24.01.2021, adminAluminium and copper metals are good conductor of heat. When exposed to air, these develop a layer of oxide. This makes it resistant to further corrosion. Calcination: i The ore is heated is absence of air. Roasting: i The ore is heated in the presence of air. In iconic compounds, ions are joined together due to powerful electrostatic forces, therefore, considerable energy is required to separate okl ions and break the lattice.
Thus ionic compounds have high melting points. There are solids due to strong force of attraction between oppositely charged ions resulting in the formation of hard crystalline lattice.
An alloy is a oll mixture of two or clasx metals, or a metals and a non-metal. It is prepared by first melting the main metal, and then dissolving the required amount of 10hh metals or non-metals. This mixture is then cooled to form an alloy of a given composition.
Metallurgy involves various processes starting with the treatment of ore to getting metals in the pure form. Question 1: Compare the properties of a typical metal and non-metal on the basis of the following: i nature of oxide formed by them ii conductivity.
Answer : i Metals from basic oxide, e. Non-metals from acidic oxide, e. Non-metals do not conduct heat or electricity, e. Question 2: How is an ore different from a mineral? Justify the statement with examples. Answer 2: The metals found in nature in combined state are called minerals. If some minerals contain a very high percentage of a particular metal and the metals can be profitably and economically extracted, then it is called an ore.
Question 1: Atmospheric air always contains moisture. Then, how can you protect iron articles from the affect of atmosphere? Answer 1: Iron articles class 10th ncert 7.3 oil be protected from the effect of atmosphere by painting, oiling and Ncert Solutions Class 10th Exercise 7.3 Inc greasing. This gives temporary protection to iron articles. For long time protection, galvanising or chrome plating are quite useful. Question 2: Explain, why some metals are more reactive and others less reactive and others less reactive?
OR What determines the reactivity of metals? Answer 2: When metals react, they lose electrons to form positive ions. Such metals which can lose electrons easily to form positive ions when reacted with other substances, are reactive metals. On the other hand, if a metal loses electrons less rapidly to form positive ions, it will reacts slowly with other substances. Such a metal will be less reactive. For example, sodium atom is a very reactive metals because it readily loses one electron, forms a positive ion which then combines with other substances.
On class 10th ncert 7.3 oil other hand, lead atom loses electrons with difficulty to form positive ions, so lead metal is less reactive. Metals that are less reactive than hydrogen do not displace it.
For example: copper and silver. Galvanisation: An iron article is coated with a layer of zinc class 10th ncert 7.3 oil, which prevents the class 10th ncert 7.3 oil to come in contact with oxygen and moisture.
Hence, rusting is class. Why are aluminium and copper metals used for making cooking vessels? Why is sodium kept immersed 10fh kerosene oil?
Sodium is very reactive. If kept exposed to air, it catches fire. Distinguish between calcinations and roasting. Ionic compounds have high melting point. Give reason in support your answer. Generally, Ionic compounds are hard crystalline class 10th ncert 7.3 oil. What are alloys? What is meant 10tu metallurgy? Important Questions on bcert Science Chapter 3 Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Class 10th ncert 7.3 oil that are more reactive than hydrogen displace it from dilute acids. For example: sodium and potassium. What are the two important ways to prevent the rusting of iron?
Oiling, greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture and oxygen present in the air cannot come into direct contact with iron. Platinum, gold and silver are used to make jewellery. Platinum, gold, and silver are used to make jewellery because they are very lustrous. Also, they are very less reactive and do not corrode easily.
Why are Sodium, potassium and lithium stored under oil? Sodium, potassium, and lithium are very reactive metals and react very vigorously with air as well as water. Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture. Aluminium class 10th ncert 7.3 oil a highly reactive metal, yet it is used to make utensils for cooking.
Though aluminium is a highly reactive metal, it is resistant to corrosion. This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen.
Also, it is light in weight and a good conductor Class 10th Ncert Book Pdf Unlock of heat. Hence, it is used to make cooking utensils. Carbonate and Sulphide ores are usually converted into oxides class 10th ncert 7.3 oil the process clsas extraction.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction because metals can be easily extracted from their oxides rather than from their carbonates and sulphides. Chapter 4: Carbon and its Compounds �.
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