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Why should a magnesium ribbon be cleaned before burning in air?

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Ques 1 : Why should a magnesium ribbon be cleaned before burning in air? Ans 1: Magnesium is very reactive metal like (Na, C a, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (Mg O) on its surface.                  Mg +  O 2 → 2 Mg O This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be used for the reaction. «« Chapter 1 NCERT Solution                                            Next question »»
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CHEMICAL BONDING AND MOLECULAR STRUCTURE

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                    1. Introduction Matter is made up of one or different type of elements. Under normal conditions no other element exists as an  independent atom in nature, except noble gases. However, a group of atoms is found to exist together as one species having characteristic properties. Such a group of atoms is called a molecule. Obviously there must be some force which holds these constituent atoms together in the molecules. The attractive force which holds various  constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond. Since the formation of chemical compounds takes place as a result of combination of atoms of various elements in different ways, it raises many questions. Why do atoms combine? Why are only certain combinations possible? Why do some  atoms combine while certain others do not? Why do molecules possess definite shapes? To answer such questions differen...
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Changing Trends And Career in Physical Education Solutions || Objective Type Questions || Objective Answers Chapter 1 Class 11 Solution || Physical Education ||

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Ques 1: “Physical Eduction is the sum of changes in an individual caused by experience centring motor activity” Who said this? (a) Prince martin  (b) Millions (c) Charls A.Butchar  (d) Cassidy Ans :  (d) Cassidy Ques 2: “Physical Education is the sum of men’s physical activities selected as to kind and conducted as to outcomes” who said this? (a) C.C.Covel  (b) Charls A Butcha (c) Williams  (d) J.B. Nash Ans :  (c) Williams Ques 3 : How many objectives of physical Education are there? (a) Four  (b) Five (c) Three  (d) Six Ans : (b) Five Ques 4 : What is the aim of physical Education? (a) Physical development  (b) Motor development (c) Mental Development  (d) All Round development Ans : (d) All Round development Ques 5: Sports management is based upon....? (a) Efficient and Talented officials  (b) Smart and clever officials (c) Weak and Greedy officials  (d) None of these  Ans : (a) Efficient and Talented of...
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Changing Trends And Career in Physical Education || Short Answer Type Questions || Short Ans Chapter 1 Class 11 Solution || Physical Education ||

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Ques 1 : What do you mean by sports journalism? Ans : In sports journalism we mean that we can gather information regarding all sports activities and to collect all different types of material required for physical education. Such physical education teachers who have skill in communicating by oral or writing can avail their career option in the field of sports journalism.  Ques 2 : What do you mean by Health related careers? Ans : In the modern world, people are more aware of their health and health related issues. Each and every person is curious about their health. He remain to be hale and healthy. He wants to adopt a healthy life style. So there is an increment in job opportunities in health related careers in field of physical education. The no. of health and weight control clubs has increased tremendously. The another career related to health career is athletics training.  Ques 3 : What is the objective of physical education? Ans : The main obje...
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