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- d. Displacement reaction 3. Explain the following terms with examples. The reaction in which the place of the ion of a less reactive element in a compound is taken by another more reactive element by formation o... 1
- c. Balanced equation 3. Explain the following terms with examples. A chemical equation in which the number of atoms of the elements in the reactant is same as the number of atoms of the elements in the produ... 1
- b. Combination reaction 3. Explain the following terms with examples. When two or more reactants combine in a reaction to form a single product, it is called a combination reaction. Example:: When HCl vapours s... 1
- Endothermic reaction Endothermic reaction: In endothermic reaction, heat is either absorbed from the surroundings or heat has to supplied from outside. It means... 1
- e. Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water. Chemical equations involved: 1) Reaction between NaOH and water NaOH(s)+H2O(l)->Na^+_((aq)) + OH^-_((aq)) + triangle (HEAT) 2) Reaction betw... 1
- d. Explain the types of reaction with reference to oxygen and hydrogen. Illustrate with examples. There are main three types of chemical reactions with reference to oxygen and hydrogen: 1.Combination Reaction 2. Decomposition Reaction 3.... 1
- c. Explain the term reactant and product giving examples. Reactants:- The substances which take part in a chemical reaction are called reactants. Products:-The substances which are formed due to the... 2
- b. How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased? The rate of chemical reaction can be increased by using catalysts. In hydrogen peroxide decomposition, (Manganese dioxide powder)MnO₂ is use... 1
- a. What is the reaction called when oxidation and reduction take place simultaneously? When oxidation and reduction takes place simultaneously, the reaction is called redox reaction. Oxidation: losing of electrons Reduction: ga... 1
- 1. Choose the correct option from the bracket and explain the statement giving reason. (Oxidation, displacement a. To prevent rusting, a layer of zinc metal is applied on iron sheets. Reason :: In this method, a thin layer of zinc is applied on iron sh... 1
- std 10th maharashtra board science part 1 Chapter 2: Periodic Classification of Element notes Download pdf for offline study 1
- 8. Write the names from the description. a. The period with electrons in the shellsK, L and M. b. The group with valency zero. c. The family of nonmetals 8. Write the names from the description. a. The period with electrons in the shells K, L and M. ⇒ Third period b. The group with valency zer... 1
- e. The third period contains only eight elements even through the electron capacity of the third shell is 18 . i) The number of elements in the first three periods depends on the electron capacity of the shells and the law of electron octet. ii. The e... 1
- d. Elements belonging to the same group have the same valency. i. The electronic configuration of the outermost shell is same for all the elements belonging to the same group. ii. So, the number of valen... 1
- c. Atomic radius goes on increasing down a group. i. As we move from top to bottom in a group, number of shells increases. ii. The outermost electrons go farther and farther from the nucleus... 1
- b. Metallic character goes on decreasing while going from left to right in a period. i. While going from left to right in a period, electrons are added to the same outermost shell. At the same time, protons get added in the n... 1
- a. Atomic radius goes on decreasing while going from left to right in a period. 1. While going from left to right within a period, the atomic number increases one by one, meaning the positive charge on the nucleus increa... 1
- c. Position of isotopes in the Mendeleev’s and the modern periodic table 1. Isotopes were discovered long time after Mendeleev developed the periodic table. All isotopes of the same element have different atomic m... 1
- b. Structure of the modern periodic table 1. The modern periodic table consists of 7 horizontal rows called the periods and 18 vertical columns called the groups. 2. Apart from these... 1
- Write short notes. a. Mendeleev’s periodic law. 1) Mendeleev organized the period table on the basis of atomic masses of elements. 2. When he arranged the 63 elements known at that time in... 1
- 5. Write the name and symbol of the element from the description. a. The atom having the smallest size. a. The atom having the smallest size. Hydrogen (H) b. The atom having the smallest atomic mass. Hydrogen (H) c. The most electronegative ato... 1
- h. 6C, 3Li, 9F, 7N, 8O Which of the above elements has the highest nonmetallic character? ₆C, ₃Li, ₉F,₇N, ₈O elements and thier electronic configuration: ₆C=2,4 ₃Li=2,1 ₉F=2,7 _( 7)N=2,5 ₈O=2,6 The element with the highest nonmeta... 1
- g. 13A1, 14Si, 11Na, 12Mg, 16S Which of the above elements has the highest metallic character? ₁₃Al, ₁₄Si, ₁₁Na, ₁₂Mg, ₁₆S Element and thier electronic configuratio : ₁₃Al=2,8,3 ₁₄Si=2,8,4 ₁₁Na=2,8,1 ₁₂Mg=2,8,2 ₁₆S=2,8,6 The element wi... 1
- f. 19K, 3 Li, 11Na, 4 Be Which of these atoms has smallest atomic radius? ₁₉K, ₃Li, ₁₁Na, ₄Be elements and thier electronic configuration: ₁₉K=2,8,8,1 ₃Li=2,1 ₁₁Na=2,8,1 ₄Be=2,2 The element with the smallest atomic... 1