10th Solved Problems involving heights and distances
Download File X Chapter : Application of Trigonometry Test paper-1 Download File X Chapter : Application of Trigonometry Test paper-2 Download File X Chapter : Application of Trigonometry Question Bank Download File X Chapter : Application of Trigonometry Assignments Download File For more papers and Questions Visit Link Application of Trigonometry
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In 1900 scientist concluded that the atom was not a simple, indivisible particle but contained sub-atomic particle – the electron represented as ‘e–’identified by J.J. Thomson. E. Goldstein in 1886 discovered the presence of new radiations in a gas discharge and called them canal rays. These rays were positively charged radiations and made up of another sub-atomic particle. This sub-atomic particle had a charge, equal in magnitude but opposite in sign to that of the electron. Its mass was approximately 2000 times as that of the electron. It was given the name of proton represented as ‘p+’.
The mass of a proton is taken as one unit and its charge as plus one. The mass of an electron is considered to be negligible and its charge is minus one. The Structure of an Atom-- According to Dalton’s atomic theory the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of Dalton’s atomic theory. Then, It became necessary to know how electrons and protons are arranged within an atom. For explaining this, many scientists proposed various atomic models. J.J. Thomson was the first one to propose a model for the structure of an atom. Related ducuments 1. Download full document by: Delhi Public School, Mathura Refinery Nagar View /Download 2. [PPT] CHAPTER - 4 STRUCTURE OF ATOM - Galaxysite.weebly.com Download 3. Download E-Book based on Chapter: Chemistry in your future 4. Chapterwise Test paper solved or unsolved View then Download 5. Sample paper: View then Download L. Lavoisier laid the foundation of chemical sciences by establishing two important laws of chemical combination.
Laws of Chemical Combination LAW OF CONSERVATION OF MASS ---- Lavoisier, states that ‘mass can neither be created nor destroyed in a chemical reaction.’ LAW OF CONSTANT PROPORTIONS --- This is also known as the law of definite proportions. This law was stated by Proust as “In a chemical substance the elements are always present in definite proportions by mass”. along with other scientists, noted e.g.In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always 1:8, whatever the source of water. Dalton’s atomic theory According to Dalton’s atomic theory, all matter, whether an element, a compound or a mixture is composed of small particles called atoms. The postulates of this theory may be stated as follows: (i) All matter is made of very tiny particles called atoms. (ii) Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. (iii) Atoms of a given element are identical in mass and chemical properties. (iv) Atoms of different elements have different masses and chemical properties. (v) Atoms combine in the ratio of small whole numbers to form compounds. (vi) The relative number and kinds of atoms are constant in a given compound. Carbon and its compounds F.A-III  QUIZ and True or False Questions Paper for class 10 Chemistry2/10/2012 Carbon and its compounds QUIZ
1. Name the product of Dehydration of ethanol with conc. H2SO4 at 443 K ? 2. What is the common name of ethanoic acid? 3. Name the allotropic form of carbon with the structure of football? 4. Name the element which shows the property of catenation to the maximum extent? 5. Name the allotropic form of carbon which contain carbon- carbon double bond? 6. Name the allotropic form of carbon which is good conductor of electricity? 7. What is the general formula of alkane? 8. Out of ethanol and methanol, which is poisonous in nature? 9. Name the class of organic compound with the fruity odour? 10. What is the molecular formula of Benzene? ANS: 1. Ehene 2.Acetic Acid 3. Flullerene 4. Carbon 5. Graphite 6.Graphite 7. CnH2n+2 8. Methanol 9. Ester 10. C6H6 Q. State whether the following statement are True or False 1. Any number of atoms can be linked by Covalent bond _____ 2. The central atom in a covalent molecule has always 8 electrons after sharing ______ 3. Covalent compound are usually water soluble ______ 4. Covalent compound has generally low melting and boiling points ______ 5. Diamond is good conductor of electricity ______ 6. Each family is characterized by functional group which is an atom or group of atoms 7. Ethanoic acid and ethanol can be distinguished by litmus test as well as by sodium bicarbonate test _ 8. Soaps are water soluble while detergents are water in- soluble ______ 9. Mineral acids are stronger acids than carboxylic acids. ______ 10. Dilute alkaline KMnO4 is an oxidising agent ______ Ans: 1. False 2.True 3.False 4. True 5. False 6. True 7. True 8.False 9.True 10.True For more Paper visit Carbon and its compound Downloads 10th CBSE Maths Chapter: Quadratic Equation Solved Question and Self Evaluation Question
More Download Paper Click on link Self Evaluation Question Quadratic Equation Solved Question and Self Evaluation Question part-1 Download File Quadratic Equation Solved Question and Self Evaluation Question part-2 Download File Assignment Class X Quadratic Equations 1. Find the value of k for kx2 + 2x - 1 = 0, so that it has two equal roots 2. Find the value of k for k x2 - 2√ 5 x + 4 = 0, so that it has two equal roots. 3. If the roots of the equation (b - c) x2 + (c - c) x + (a - b) = 0 are equal, accordingly prove that 2b = a + c. 4. Find the discriminant of the quadratic equation 3x2– 4 √3 x + 4 = 0, and hence find the nature of its roots. 5. Find the value of k for 2 x2 + k x + 3 = 0, so that it has two equal roots. 6. Find the value of k for k x (x – 2) + 6 = 0, so that it has two equal roots. 7. Find the value of k for which the equation x2 + 5kx + 16 = 0 has no real roots. 8 Find the discriminant of the quadratic equation 2x2– 6x + 3 = 0, and hence find the nature of its roots. 9. Find the value of k for k2 x2 – 2 (2 k - 1) x + 4 = 0, so that it has two equal roots. 10. Find the value of k for (k + 1) x2 – 2 ( k - 1) x + 1= 0, so that it has two equal roots. |
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