Science Part 1
science maharashtra board 10th
- Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of Correct answer is 11 ohm 1
- Explain the construction and working of the following. Draw a neat diagram and label it. a. Electric motor b. Electric Generator(AC) A) Electric motor The electric motor consists of rectangular loop of copper wire having resistive coating. As shown in the figure, it is pla... 1
- Fuse wire, bad conductor, rubber gloves, generator. b. Voltmeter, Ammeter, galvanometer, thermometer. a. Fuse wire, bud conductor, rubber gloves, generator. Answer: Generator. It converts mechanical energy into electric energy, the remaining... 1
- Identify from the following reactions the reactants that undergo oxidation and reduction A. Fe + S → FeS Here , Fe is oxidised from 0 to +2, while S is reduced from 0 to -2 Fe undergoes oxidation (as losing electrons) Sulphur und... 1
- 5. Observe the following picture a write down the chemical reaction with explanation. The picture given shows the corrosion of iron. The chemical formula of rust is Fe₂O₃.H₂O. The rust on iron does not form by a simple reactio... 1
- d. It is recommended to use air tight container for storing oil for long time It is recommended to use air tight container for storing oil for long time because, When oil comes in contact with air, it undergoes oxidati... 1
- c.While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to... 1
- b. It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly When HCl is added to Shahabad stone effervescence of CO₂ is formed. The CO₂effervescence is formed slowly with the pieces of Shahabad tiles... 1
- a.When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky i. When limestone (CaCO₃) is heated; it undergoes decomposition reaction giving calcium oxide (CaO) and carbon dioxide (CO₂) as products. ii... 1
- 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