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Galvanisation: An iron article is coated with a layer of zinc metal, which prevents the iron to come in contact with oxygen and moisture. Hence, rusting is prevented. Why are aluminium and copper metals used for making cooking vessels? Why is sodium kept immersed in 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 solids. What are alloys? What is meant by metallurgy? Important Questions on 10th Science Chapter 3 Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Metals 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. Assume there are four families in a country. The average per capita income of these families is Rs If the income of three families is Rs , Rs and Rs respectively, what is the income of the fourth family?
What is Ncert Solutions Class 10th Chemistry Chapter 3 Swift the main criterion used by the World Bank in classifying different countries? What are the limitations of this criterion, if any? In what respects is the criterion used by the UNDP for measuring development different from the one used by the World Bank? Why do we use averages? Are there any limitations to their use? Illustrate with your own examples related to the development. Kerala, with lower per capita income, has a better human development ranking than Punjab.
Hence, per capita income is not a useful criterion at all and should not be used to compare states. Do you agree? It is correct to say that per capita Class 10th Chemistry Chapter 5 Ncert Solutions Company income is not a useful criterion at all and should not be used to compare states due to reasons as mentioned below :.
Find out the present sources of energy that are used by the people in India. What could be the other possibilities fifty years from now? The present sources of energy that are used by the people of India are electricity, coal, crude oil, cowdung and solar energy. Other possibilities fifty years from now, could include ethanol, bio-diesel, nuclear energy and better utilization of wind energy, especially with the imminent danger of oil resources running out.
Why is the issue of sustainability is important for development? Sustainable development means that development should meet the needs of the present without compromising the ability of future generations to meet their needs. However, since the second Ncert Solutions Class 10th Chemistry Chapter 4 Review half of the twentieth century, a number of scientists have been warning that the present type and levels of development are not sustainable.
The issue of sustainable development has emerged from rapid industrialization of the world in the past century. It is felt that economic growth and industrialization have led to the reckless exploitation of natural resources.
On the other hand, the stock of natural resources are limited. So, the growth of all countries in the future is likely to be endangered if the limited resources are completely exhausted. Under these circumstances, the issue of sustainability has become important for development. A number of resources are being overused. For example, groundwater is under serious threat of overuse in many parts of the country i.
The water level has declined over 4 meters. As a result of it if we go on overusing there will be a water crisis in future. Similarly, if non-renewable resources are used recklessly these will also be exhausted.
Page Q This statement is relevant to the discussion of development since both resources and development go hand in hand. For the sustainability of development, the consumption and maintenance of resources is also crucial. We have to use the resources keeping our environment protected and clear so that there is a balance between the development and use of our resources.
As otherwise after a certain point of time in future the development will be stagnated. List a few examples of environmental degradation that you may have observed around you. Chapter 7 - Control and Coordination. Chapter 8 - How do Organisms Reproduce? Chapter 9 - Heredity and Evolution. Chapter 10 - Light Reflection and Refraction.
Chapter 11 - Human Eye and Colourful World. Chapter 12 - Electricity. Chapter 13 - Magnetic Effects of Electric Current. Chapter 14 - Sources of Energy. Chapter 15 - Our Environment. Chapter 16 - Management of Natural Resources.
Having legitimate information on the hypotheses, the adequate practice of the reactions, conditions, and equations, and question-solving ability from the NCERT Chemistry books Ncert Solutions Of Class 10th Chemistry Chapter 2 Im are very significant for prospects and increase the possibility of bagging a good score. This helps students to gain a better understanding of the chapter's concepts through these easy and comprehensive solutions.
Class 10th science chapter 2 is part of unit 1, Chemical Substances - Nature and Behaviours. This chapter portrays acid and base reactions and depicts how acid and base generally cancel out each other. Acid, base and salt class 10 includes topics such as How do Acids and Bases react with each other or metals, Reaction of acid with Hydrogen carbonates and Metallic oxides, Reaction of bases with oxides, etc.
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